Discontinued Operations and Disposal Groups [Abstract] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Herley Herley Industries Inc [Member] Herley Industries Inc [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Revenue Disposal Group, Including Discontinued Operation, Revenue Cost of sales Disposal Group, Including Discontinued Operation, Costs of Goods Sold Selling, general and administrative expenses Disposal Group, Including Discontinued Operation, General and Administrative Expense Other (income) expense items that are not major Disposal Group, Including Discontinued Operation, Other Income (Expense) Disposal Group, Including Discontinued Operation, Other Income (Expense) Income (loss) from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax Gain on disposal of discontinued operations before income taxes Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Total gain (loss) of discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Income tax expense (benefit) Discontinued Operation, Tax Effect of Discontinued Operation Income (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Shares from stock options and awards Stock Options and Stock Awards [Member] Stock Options and Stock Awards [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of EPS (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior notes Senior Notes [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 6.5% Notes Six Point Five Percent Senior Secured Notes Due 2025 [Member] Six Point Five Percent Senior Secured Notes Due 2025 [Member] 7% Senior Notes due 2019 Seven Percent Senior Notes Due 2019 [Member] Seven Percent Senior Notes Due 2019 [Member] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] On or after November 30, 2020 Debt Instrument, Redemption, Period One [Member] On or prior to November 30, 2020 Debt Instrument, Redemption, Period Two [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Principal Debt Instrument, Face Amount Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Debt issuance costs Debt Issuance Costs, Gross Reacquisition price Debt Instrument, Repurchase Amount Premium Debt Instrument, Unamortized Premium Accrued interest Debt Instrument, Increase, Accrued Interest Redemption percentage Debt Instrument, Redemption Price, Percentage Percentage of principal amount Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Net Income (Loss) Per Common Share Earnings Per Share [Text Block] Statement of Comprehensive Income [Abstract] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in cumulative translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Postretirement benefit reserve adjustment net of tax expense Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to Kratos Comprehensive Income (Loss), Net of Tax, Attributable to Parent Segment Reporting [Abstract] Significant Customers Significant Customers Disclosure [Text Block] Significant Customers Disclosure [Text Block] Debt Debt Disclosure [Text Block] Leases [Abstract] 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years 2023 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total future minimum lease payments Operating Leases, Future Minimum Payments Due Retirement Benefits [Abstract] Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Income Tax Disclosure [Abstract] Schedule of Income before Income Tax, Domestic and Foreign Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Income Tax Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Unrecognized Tax Benefits Roll Forward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Common stock sold (in shares) Stock Issued During Period, Shares, New Issues Purchase price of common stock sold (dollars per share) Sale of Stock, Price Per Share Gross proceeds from sell of stock Sale of Stock, Consideration Received on Transaction Gross Proceeds From Issuance Of Common Stock Gross Proceeds (expenses) from the issuance of common stock Proceeds from Issuance of Common Stock Net proceeds used to pay-off debt Repayments of Secured Debt Schedule of Revenue by Major Customers, by Reportiing Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] U.S. Government U.S. Government [Member] U.S. Government, major customer [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Kratos Government Solutions (KGS) Kratos Government Solutions [Member] Kratos Government Solutions operating/reportable segment Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Sales to the U.S. Government - percentage of total revenue Concentration Risk, Percentage Fair value of long-term debt Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer relationships Customer Relationships [Member] Contracts and backlog Contracts and Backlog [Member] Contracts and Backlog [Member] Developed technology and technical know-how Developed Technology Rights [Member] Trade names Trade Names [Member] Favorable Operating Lease [Member] Favorable Operating Lease [Member] Favorable Operating Lease [Member] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Acquired finite-lived intangible assets: Finite-Lived Intangible Assets, Net [Abstract] Gross Value Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Total Finite-Lived Intangible Assets, Net Indefinite-lived trade names Indefinite-lived Intangible Assets (Excluding Goodwill) Total intangible assets, Gross Value Intangible Assets, Gross (Excluding Goodwill) Total intangible assets, Net Value Intangible Assets, Net (Excluding Goodwill) Aggregate amortization expense for finite-live intangible assets Amortization of Intangible Assets Operating Leases Lessee, Operating Lease, Liability, Payment, Due [Abstract] 2020 Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total lease payments Lessee, Operating Lease, Liability, Payments, Due Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Total present value of lease liabilities Operating Lease, Liability Finance Leases Finance Lease, Liability, Payment, Due [Abstract] 2020 Finance Lease, Liability, Payments, Due Next Twelve Months 2021 Finance Lease, Liability, Payments, Due Year Two 2022 Finance Lease, Liability, Payments, Due Year Three 2023 Finance Lease, Liability, Payments, Due Year Four 2024 Finance Lease, Liability, Payments, Due Year Five Thereafter Finance Lease, Liability, Payments, Due after Year Five Total lease payments Finance Lease, Liability, Payment, Due Less: imputed interest Finance Lease, Liability, Undiscounted Excess Amount Total present value of lease liabilities Finance Lease, Liability Income tax (benefit) at federal statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State taxes, net of federal tax benefit and valuation allowance Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Difference in tax rates between U.S. and foreign Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Increase (decrease) in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Nondeductible expense Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Increase in reserve for uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Changes to indefinite life items and separate state deferred taxes Income Tax Reconciliation, Changes to Indefinite Life Items and Separate State Deferred Taxes Income Tax Reconciliation, Changes to Indefinite Life Items and Separate State Deferred Taxes One-time transition tax on previously undistributed foreign earnings Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Amount Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Amount Goodwill impairment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount Decrease in deferred taxes related to disposition Effective Income Tax Rate Reconciliation, Disposition of Asset, Amount Impact related to the 2017 Tax Cuts and Jobs Act Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount Release of valuation allowance due to FTT acquisition Income Tax Reconciliation, Release Of Valuation Allowance, Business Combination Income Tax Reconciliation, Release Of Valuation Allowance, Business Combination Stock-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Total Income Tax Expense (Benefit) Segment Information Segment Reporting Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Balance Sheet Details Supplemental Balance Sheet Disclosures [Text Block] Unrecognized Tax Benefits Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at the beginning of period Unrecognized Tax Benefits Increases related to prior periods Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Increases related to current year tax positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Expiration of applicable statutes of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Decrease in federal tax rate Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Decrease in federal tax rate Decreases related to disposition Unrecognized Tax Benefits, Decrease Resulting from Disposition Unrecognized Tax Benefits, Decrease Resulting from Disposition Balance at the end of period Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Share-based Payment Arrangement [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Minimum weekly employment threshold to qualify for ESPP Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award, Minimum Weekly Employment Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award, Minimum Weekly Employment Minimum annual employment threshold to qualify for ESPP Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award, Minimum Annual Employment Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award, Minimum Annual Employment Maximum percentage of employee compensation eligible to purchase shares under ESPP (percent) Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Purchase price of common stock as a percent of fair market value (percent) Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Cumulative number of shares issued under ESPP (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number Number of shares available for future issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Number of shares issued under the plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Average share price of shares issued under the plan (dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased Assumptions and resulting fair values of options granted Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Risk-free interest rate, lower range (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk-free interest rate, upper range (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Expected volatility, lower range (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Expected volatility, upper range (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Expected dividend yield (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted average grant-date fair value per share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Income Statement [Abstract] Statement [Table] Statement [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Service revenues Service [Member] Product sales Product [Member] Statement [Line Items] Statement [Line Items] Total revenues Total costs Cost of Goods and Services Sold Gross profit Gross Profit Selling, general and administrative expenses Selling, General and Administrative Expense Merger and acquisition related items Business Combination, Acquisition Related Costs Research and development expenses Research and Development Expense Impairment of goodwill Goodwill and Intangible Asset Impairment Restructuring expenses and other Impairment Charges And Adjustments To Unused Office Space Liability Impairment Charges And Adjustments To Unused Office Space Liability Operating income (loss) Operating Income (Loss) Other income (expense): Other Nonoperating Income (Expense) [Abstract] Interest expense, net Interest Income (Expense), Nonoperating, Net Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Other income (expense), net Other Nonoperating Income (Expense) Total other expense, net Nonoperating Income (Expense) Income (loss) from continuing operations before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Provision (benefit) for income taxes from continuing operations Income (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (loss) from operations of discontinued component (including gain on disposal of $0.0 million for the year ended December 30, 2018) Less: Net income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Net income (loss) attributable to Kratos Net Income (Loss) Attributable to Parent Basic income and (loss) per common share attributable to Kratos: Earnings Per Share, Basic [Abstract] Income (loss) from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Income (loss) from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Net income (loss) per common share (in dollars per share) Earnings Per Share, Basic Diluted income and (loss) per common share attributable to Kratos: Earnings Per Share, Diluted [Abstract] Income (loss) from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Income (loss) from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Net income (loss) per common share (in dollars per share) Earnings Per Share, Diluted Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Stock Option Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Stock Options Roll Forward Schedule of Stock Options Roll Forward [Table Text Block] Grants and Exercises Under the Company's Option Plans Share-based Compensation Arrangement By Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value and Exercises in Period, Total Intrinsic Value [Table Text Block] Share-based Compensation Arrangement By Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value and Exercises in Period, Total Intrinsic Value [Table Text Block] Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Assumptions and Resulting Fair Values of Options Granted Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Corporate activities Segment Reconciling Items [Member] Kratos Government Solutions Unmanned Systems Kratos Unmanned Systems [Member] Kratos Unmanned Systems [Member] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Discontinued operations Discontinued Operations [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Depreciation and amortization Depreciation, Depletion and Amortization Total operating income (loss) Total assets Assets Quarterly Financial Information Disclosure [Abstract] Summarized Quarterly Financial Information Quarterly Financial Information [Table Text Block] Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Florida Turbine Technologies, Inc. Florida Turbine Technologies, Inc. [Member] Florida Turbine Technologies, Inc. [Member] FTT Core, LLC FTT Core, LLC [Member] FTT Core, LLC [Member] FTT Inc FTT Inc [Member] FTT Inc [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] In orocess research and development In Process Research and Development [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Discount Rate Measurement Input, Discount Rate [Member] Royalty Rate Measurement Input, Royalty Rate [Member] Measurement Input, Royalty Rate [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Income Approach Valuation, Income Approach [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 3 Fair Value, Inputs, Level 3 [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Business acquisition, percentage of voting Interests acquired Business Acquisition, Percentage of Voting Interests Acquired Purchase price Business Combination, Consideration Transferred Payments to acquire businesses, gross, including amounts to be paid Payments to Acquire Businesses, Gross, Including Amounts To Be Paid Payments to Acquire Businesses, Gross, Including Amounts To Be Paid Cash paid Payments to Acquire Businesses, Gross Payments to acquire businesses, amount to be paid Payments to Acquire Businesses, Amount To Be Paid Payments to Acquire Businesses, Amount To Be Paid Payment period Payments to Acquire Businesses, Payment Period Payments to Acquire Businesses, Payment Period Business acquisition, equity interest issued or issuable, number of shares Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Business acquisition, equity interest issued or issuable, value assigned Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Business combination, recognized identifiable assets acquired and liabilities assumed, current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Finite-lived lntangible assets acquired Finite-lived Intangible Assets Acquired Acquired finite-lived intangible assets, weighted average useful life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Deferred tax Liabilities, net Deferred Tax Liabilities, Net Discount rate Business Combination, Contingent Consideration, Liability, Measurement Input Business combination, pro forma information, revenue of acquiree since acquisition date, actual Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Pro forma revenues Business Acquisition, Pro Forma Revenue Pro forma net income before tax Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Before Tax Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Before Tax Pro forma net income Business Acquisition, Pro Forma Net Income (Loss) Net income (loss) Basic pro forma income per share attributable to Kratos (in shares) Business Acquisition, Pro Forma Earnings Per Share, Basic Diluted pro forma income per share attributable to Kratos (in shares) Business Acquisition, Pro Forma Earnings Per Share, Diluted Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Contract assets, Net change Contract With Customer, Asset, Increase (Decrease) Contract With Customer, Asset, Increase (Decrease) Contract liabilities Contract with Customer, Liability Contract liabilities, Net change Contract With Customer, Liability, Increase (Decrease) Contract With Customer, Liability, Increase (Decrease) Net contract assets Contract With Customer, Asset (Liability), Net Contract With Customer, Asset (Liability), Net Net contract assets, Net change Contract With Customer, Asset (Liability), Net Increase (Decrease) Contract With Customer, Asset (Liability), Net Increase (Decrease) Components of Deferred Tax Assets and Liabilities [Abstract] Components of Deferred Tax Assets and Liabilities [Abstract] Deferred tax assets: Components of Deferred Tax Assets [Abstract] Allowance for doubtful accounts Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Sundry accruals Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Vacation accrual Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Compensated Absences Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Payroll related accruals Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Lease accruals Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent Investments Deferred Tax Assets, Investments Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Capital loss carryforwards Deferred Tax Assets, Capital Loss Carryforwards Tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards Deferred revenue Deferred Tax Assets, Deferred Income Reserves and other Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves and Other Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves and Other Gross deferred tax assets Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Total deferred tax assets, net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Unearned revenue Deferred Tax Liabilities, Unearned Revenue Deferred Tax Liabilities, Unearned Revenue Deferred Tax Liabilities, Operating Lease Right-of-use Assets Deferred Tax Liabilities, Operating Lease Right-of-use Assets Deferred Tax Liabilities, Operating Lease Right-of-use Assets Other intangibles Deferred Tax Liabilities, Intangible Assets Property and equipment, principally due to differences in depreciation Deferred Tax Liabilities, Property, Plant and Equipment Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax liability New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Restatement [Axis] Restatement [Axis] Restatement [Domain] Restatement [Domain] ASC 606 Adjustment Restatement Adjustment [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASC 606 Accounting Standards Update 2014-09 [Member] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] Effect of Change Higher/(Lower) Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Billing Status, Type [Axis] Billing Status, Type [Axis] Receivables Billing Status [Domain] Receivables Billing Status [Domain] Unbilled Unbilled Revenues [Member] T for C T for C [Member] T for C [Member] International Customer International Customer [Member] International Customer [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Accumulated deficit Retained Earnings (Accumulated Deficit) Cost of revenue Cost of Revenue Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Provision for loss on contracts Provision for Loss on Contracts Revenue recognized Contract with Customer, Liability, Revenue Recognized Accounts receivable Accounts Receivable, before Allowance for Credit Loss Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] COLORADO COLORADO Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Property, plant and equipment, net Finance Lease, Right-of-Use Asset Operating leases, rent expense, minimum rentals Operating Leases, Rent Expense, Minimum Rentals Operating leases, rent expense, sublease rentals Operating Leases, Rent Expense, Sublease Rentals Sublease income Operating Leases, Income Statement, Sublease Revenue Organization and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Finance lease - cash paid for interest Finance Lease, Interest Payment on Liability Finance lease - financing cash flows Finance Lease, Principal Payments Operating lease - operating cash flows (fixed payments) Operating Lease, Payments Leases Leases of Lessee Disclosure [Text Block] Gain on disposal Statement of Financial Position [Abstract] Preferred Stock: Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Shares authorized (in shares) Preferred Stock, Shares Authorized Par value (usd per share) Preferred Stock, Par or Stated Value Per Share Shares outstanding (in shares) Preferred Stock, Shares Outstanding Common Stock: Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Par value (in dollars per share) Common Stock, Par or Stated Value Per Share Shares authorized (in shares) Common Stock, Shares Authorized Shares issued (in shares) Common Stock, Shares, Issued Shares outstanding (in shares) Common Stock, Shares, Outstanding Operating Leases: Operating Lease, Assets And Liabilities, Lessee [Abstract] Operating Lease, Assets And Liabilities, Lessee [Abstract] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Current portion of operating lease liabilities Operating Lease, Liability, Current Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Finance leases: Finance Lease, Assets And Liabilities, Lessee [Abstract] Finance Lease, Assets And Liabilities, Lessee [Abstract] Other current liabilities Finance Lease, Liability, Current Other long-term liabilities Finance Lease, Liability, Noncurrent Non-US Non-US [Member] Number of reportable segments Number of Reportable Segments Percentage of foreign revenue to total revenue (as a percent) Entity Wide Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries, Percentage Entity Wide Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries, Percentage Impairment of goodwill Goodwill, Impairment Loss Assets of foreign subsidiaries Entity Wide Disclosure on Geographic Areas, Assets in Foreign Countries Entity Wide Disclosure on Geographic Areas, Assets in Foreign Countries Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Fixed price Fixed-price Contract [Member] Cost plus fee Cost Plus Fee Contract [Member] Cost Plus Fee Contract [Member] Time and materials Time-and-materials Contract [Member] U.S. Government United States Government [Member] United States Government [Member] International Non-US Government [Member] Non-US Government [Member] U.S. Commercial and other customers United States Commercial And Other Customers [Member] United States Commercial And Other Customers [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Stock options Share-based Payment Arrangement, Option [Member] Expected life Volatility, lower range (percent) Volatility, upper range (percent) Forfeiture rate (percent) Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Rate Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Rate Dividend yield (percent) Number of Shares Under Option Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options outstanding at beginning of period, Number of Options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted, Number of Options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised, Number of Options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited or expired, Number of Options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Options outstanding at end of period, Number of Options (in shares) Options exercisable, Number of Options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted-Average Exercise Price per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Options outstanding at beginning of period, Weighted-Average Exercise Price per Share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted, Weighted-Average Exercise Price per Share (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised, Weighted-Average Exercise Price per Share (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited or expired, Weighted-Average Exercise Price per Share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Options outstanding at end of period, Weighted-Average Exercise Price per Share (in dollars per share) Options exercisable, Weighted-Average Exercise Price per Share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted- Average Remaining Contractual Term and Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Options outstanding, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options exercisable, Weighted-Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Options outstanding, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options exercisable, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Weighted average grant date fair value of options granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Total intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Business Acquisitions by Acquisition, Contingent Consideration Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block] Business Acquisition, Pro Forma Information Business Acquisition, Pro Forma Information [Table Text Block] Income Taxes Income Tax Disclosure [Text Block] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2020 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2024 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Total Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents, Current Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Unbilled receivables, net Contract with Customer, Asset, Net, Current Inventoried costs Inventory, Net of Allowances, Customer Advances and Progress Billings Prepaid expenses Prepaid Expense, Current Other current assets Other Assets, Current Current assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets, Current Total current assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Intangible assets, net Other assets Other Assets, Noncurrent Total assets Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses Accrued Liabilities, Current Accrued compensation Employee-related Liabilities, Current Accrued interest Interest Payable, Current Billings in excess of costs and earnings on uncompleted contracts Contract with Customer, Liability, Current Other current liabilities Other Liabilities, Current Current liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Current Total current liabilities Liabilities, Current Long-term debt Long-term Debt, Excluding Current Maturities Other long-term liabilities Other Liabilities, Noncurrent Long-term liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 15) Commitments and Contingencies Redeemable noncontrolling interest Temporary Equity, Carrying Amount, Attributable to Parent Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.001 par value, 5,000,000 authorized, 0 shares outstanding at December 29, 2019 and December 30, 2018 Preferred Stock, Value, Issued Common stock, $0.001 par value, 195,000,000 shares authorized; 106,635,508 and 103,766,899 shares issued and outstanding at December 29, 2019 and December 30, 2018, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Total stockholders’ equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and stockholders’ equity Liabilities and Equity Cash and Cash Equivalents Cash and Cash Equivalents [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Legal Entity of Counterparty, Type [Axis] Legal Entity of Counterparty, Type [Axis] Legal Entity Type of Counterparty [Domain] Legal Entity Type of Counterparty [Domain] U.S. Government Government [Member] Billed Billed Revenues [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Total current accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Total accounts receivable and unbilled receivables, net Accounts Receivable, after Allowance for Credit Loss, Noncurrent Total U.S. Government contract receivables Accounts Receivable, after Allowance for Credit Loss Inventory, Net of Allowances, Customer Advances and Progress Billings [Abstract] Inventory, Net of Allowances, Customer Advances and Progress Billings [Abstract] Raw materials Inventory, Raw Materials, Net of Reserves Work in process Inventory, Work in Process, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves Total inventoried costs Carrying Amount Long-term Debt Fair Value Long-term Debt, Fair Value Debt issuance costs Debt Issuance Costs, Net Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2014 Plan Two Thousand Fourteen Plan [Member] Two Thousand Fourteen Plan [Member] Stock Options and Restricted Stock Units Stock Options and Restricted Stock Units [Member] Stock Options and Restricted Stock Units [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Maximum Maximum [Member] Stock awards granted Number of shares available for issuance (in shares) Total number of awards outstanding (shares) Share-Based Compensation Arrangement By Share Based Payment Award, Options And Other Than Options, Outstanding Number Share-Based Compensation Arrangement By Share Based Payment Award, Options And Other Than Options, Outstanding Number Share-based incentive award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Award term or expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Total unrecognized stock-based compensation expense related to nonvested restricted stock units Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Unrecognized stock-based compensation expense, period for recognition Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Fair value of vested awards Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land and buildings Land and Building [Member] Computer equipment and software Computer Equipment [Member] Machinery and equipment Other Machinery and Equipment [Member] Furniture and office equipment Office Equipment [Member] Leasehold improvements Leasehold Improvements [Member] Construction in progress Construction in Progress [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Finance lease right of use assets Finance Lease, Right-of-Use Asset, before Accumulated Amortization Finance Lease, Right-of-Use Asset, before Accumulated Amortization Property and equipment Property, Plant and Equipment, Gross Property and equipment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Accumulated depreciation and amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total property and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Total property and equipment, net Depreciation expense Depreciation and Amortization of Leased Assets Depreciation and Amortization of Leased Assets Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule of Acquired Finite-Lived Intangible Assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of Future Amortization Expense of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Expected timing of satisfaction, percentage Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Percentage Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Percentage Cover page. Document Type Document Type Document Annual Report Document Annual Report Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Principles of Consolidation and Basis of Presentation Consolidation, Policy [Policy Text Block] Fiscal Year Fiscal Period, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Revenue Recognition Revenue from Contract with 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Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested balance at beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Grants (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Vested but not released (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested But Not Released Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested But Not Released Nonvested balance at end of period (in shares) Weighted-Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment 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Award, Equity Instruments Other than Options, Grants in Period But Not Released, Weighted Average Grant Date Fair Value Nonvested balance at end of period, Weighted-Average Grant Date Fair Value (in dollars per share) Fair Value Disclosures [Abstract] Fair Value Measurement Fair Value Disclosures [Text Block] Schedule of Lease Cost Lease, Cost [Table Text Block] Balance Sheet Information Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Maturities of Financing Lease Liabilities Finance Lease, Liability, Maturity [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Amortization of right of use assets - finance leases Finance Lease, Right-of-Use Asset, Amortization Interest expense on lease liabilities - finance leases Finance Lease, Interest Expense Operating lease cost (expense resulting from amortization of total lease payments) Operating Lease, Cost Short-term lease cost Short-term Lease, Cost Variable lease cost (cost excluded from lease payments) Variable Lease, Cost Sublease income Sublease Income Total lease cost Lease, Cost Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Unbilled receivables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Unbilled Receivables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Unbilled Receivables Inventoried costs Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Property and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Total identifiable net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Total identifiable net liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Net assets before noncontrolling interest Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Noncontrolling interest Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Net assets acquired, excluding cash Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Deferred purchase consideration Business Combination, Consideration Transferred, Liabilities Incurred Common stock issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Consideration transferred, gross Business Combination, Consideration Transferred, Gross Business Combination, Consideration Transferred, Gross Less: Cash acquired Cash Acquired from Acquisition Total consideration Gross profit Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Income (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Basic income (loss) per common share: Income (loss) from continuing operations (in dollars per share) Diluted income (loss) per common share: Acquision Business Combination Disclosure [Text Block] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Federal Domestic Tax Authority [Member] State State and Local Jurisdiction [Member] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Increase in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Operating loss carryforwards Operating Loss Carryforwards Unrecognized deferred income taxes or foreign withholding taxes Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries Unrecognized deferred income taxes or foreign withholding taxes, cash and cash equivalents available for distribution Deferred Tax Liability Not Recognized, Undistributed Earnings of Foreign Subsidiaries, Cash and Cash Equivalents Available for Distribution Deferred Tax Liability Not Recognized, Undistributed Earnings of Foreign Subsidiaries, Cash and Cash Equivalents Available for Distribution Unrecognized tax benefits that if recognized would affect effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Amount that would become a deferred tax asset included in unrecognized tax benefits that would impact the effective tax rate Unrecognized Tax Benefits That Would Impact Effective Tax Rate, Deferred Tax Assets Unrecognized Tax Benefits That Would Impact Effective Tax Rate, Deferred Tax Assets Income tax penalties and interest expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Benefit for income tax penalties and interest related to reversal of prior positions Unrecognized Tax Benefits, Income Tax Penalties and Interest Benefit, Reversals of Prior Positions Unrecognized Tax Benefits, Income Tax Penalties and Interest Benefit, Reversals of Prior Positions Total interest and penalties accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Unrecognized tax benefits that will expire within the next 12 months Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Schedule of Net Contract Assets (Liabilities) Contract with Customer, Asset and Liability [Table Text Block] Schedule of disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Schedule of Valuation and Qualifying Accounts Disclosure Financing Receivable, Allowance for Credit Loss [Table Text Block] Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Interest Expense, Net Schedule of Interest Expense, Net [Table Text Block] Schedule of Interest Expense, Net [Table Text Block] Schedule of Disposal Groups, Including 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purchase plan, options and warrants (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Issuance of common stock for employee stock purchase plan, options and warrants Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Restricted stock issued and related taxes (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Restricted stock issued and related taxes Restricted Stock, Value, Shares Issued Net of Tax Withholdings Issuance of common stock for acquisitions (in shares) Stock Issued During Period, Shares, Acquisitions Issuance of common stock for acquisitions Stock Issued During Period, Value, Acquisitions Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Balance, end of period (in shares) Balance, end of period Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Balance, beginning Redeemable Noncontrolling Interest, Equity, Carrying Amount Net income Temporary Equity, Net Income Changes in noncontrolling interest Temporary Equity, Increase from Business Combination Temporary Equity, Increase from Business Combination Balance, ending Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Kratos Unmanned Systems (US) Goodwill [Line Items] Goodwill [Line Items] Number of operating segments Number of Operating Segments Number of lost contract opportunities Number Of Lost Contract Opportunities Number Of Lost Contract Opportunities Lost contract opportunities period Lost Contract Opportunities Period Lost Contract Opportunities Period Carrying amounts of goodwill by reportable segment Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Gross value Goodwill, Gross Less accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Net Schedule of Accounts, Notes, Loans and Financing Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Inventory, Current Schedule of Inventory, Current [Table Text Block] Noncontrolling Interest [Abstract] Redeemable Noncontrolling Interest Noncontrolling Interest Disclosure [Text Block] Components of income (loss) from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest [Abstract] Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Provision (benefit) for income taxes from continuing operations Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract] Federal income taxes: Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Federal Tax Expense (Benefit) Deferred Deferred Federal Income Tax Expense (Benefit) Total Federal Federal Income Tax Expense (Benefit), Continuing Operations State and local income taxes State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current State and Local Tax Expense (Benefit) Deferred Deferred State and Local Income Tax Expense (Benefit) Total State and local State and Local Income Tax Expense (Benefit), Continuing Operations Foreign income taxes: Foreign Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Foreign Tax Expense (Benefit) Deferred Deferred Foreign Income Tax Expense (Benefit) Total Foreign Foreign Income Tax Expense (Benefit), Continuing Operations Accounts receivable, net Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Other current assets Disposal Group, Including Discontinued Operation, Other Assets, Current Current assets of discontinued operations Accounts payable Disposal Group, Including Discontinued Operation, Accounts Payable, Current Accrued expenses Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current Other current liabilities Disposal Group, Including Discontinued Operation, Other Liabilities, Current Current liabilities of discontinued operations Other long-term liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent Significant Accounting Policies Disclosure [Table] Significant Accounting Policies Disclosure [Table] Significant Accounting Policies Disclosure [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Income Statement Location [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Income Statement Location [Domain] Continuing operations Continuing Operations [Member] Selling, general and administrative expenses Selling, General and Administrative Expenses [Member] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Allowance for Doubtful Accounts SEC Schedule, 12-09, Allowance, Credit Loss [Member] Buildings and improvements Building and Building Improvements [Member] Vehicles, furniture, and office equipment Vehicles, Furniture, and Office Equipment [Member] Vehicles, Furniture, and Office Equipment [Member] Significant Accounting Policies Disclosure [Line Items] Significant Accounting Policies Disclosure [Line Items] [Line Items] for Significant Accounting Policies Disclosure [Table] Useful life of finite-lived intangible assets Finite-Lived Intangible Asset, Useful Life Share-based Compensation Share-based Payment Arrangement, Expensed and Capitalized, Amount [Abstract] Employee Stock Purchase Plan offering & expense recognition period Employee Stock Purchase Plan, Offering Period Employee Stock Purchase Plan, Offering Period Deferred tax benefit from stock options exercised Deferred Tax Benefit from Stock Options Exercised Deferred Tax Benefit from Stock Options Exercised Stock-based compensation expense, amount recognized in the consolidated financial statements Share-based Payment Arrangement, Expense Allowance for Doubtful Accounts Accounts Receivable, Allowance for Credit Loss [Roll Forward] Balance at Beginning of Year Accounts Receivable, Allowance for Credit Loss Provisions Accounts Receivable, Credit Loss Expense (Reversal) Write-offs/Recoveries Allowance for Doubtful Accounts Receivable, Charge-offs and Recoveries, Net Allowance for Doubtful Accounts Receivable, Charge-offs and Recoveries, Net Balance at End of Year Property and Equipment, Net Property, Plant and Equipment [Abstract] Useful life of property and equipment Property, Plant and Equipment, Useful Life Interest Expense, Net Interest Income (Expense), Net [Abstract] Interest expense incurred primarily on the Senior Secured Notes Interest Expense, Debt Miscellaneous interest income Interest Income, Other Interest expense, net Interest Expense (Income), Net Interest expense on debt and miscellaneous interest income Foreign Currency Foreign Currency [Abstract] Foreign currency transaction gain (loss) Foreign Currency Transaction Gain (Loss), before Tax Recent Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Operating lease liability Stockholders' Equity Shareholders' Equity and Share-based Payments [Text Block] Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net income (loss) Income (loss) from discontinued operations Income (loss) from continuing operations Adjustments to reconcile income (loss) from continuing operations to net cash provided by (used in) operating activities from continuing operations: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Deferred income taxes Deferred Income Tax Expense (Benefit) Amortization of lease right-of-use assets Operating And Finance Lease, Right-of-Use Asset, Amortization Operating And Finance Lease, Right-of-Use Asset, Amortization Stock-based compensation Share-based Payment Arrangement, Noncash Expense Goodwill impairment charge Loss on extinguishment of debt Amortization of deferred financing costs Amortization of Deferred Charges Amortization of premium and discount on Senior Secured Notes Amortization of Debt Discount (Premium) Provision for doubtful accounts Changes in assets and liabilities, net of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Unbilled receivables Increase (Decrease) in Contract with Customer, Asset Inventoried costs Increase (Decrease) in Inventories Prepaid expenses Increase (Decrease) in Prepaid Expense Other assets Increase (Decrease) in Other Operating Assets Operating lease liabilities Increase (Decrease) In Operating Lease Liabilities Increase (Decrease) In Operating Lease Liabilities Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses Increase (Decrease) in Other Accrued Liabilities Accrued compensation Increase (Decrease) in Employee Related Liabilities Accrued interest Increase (Decrease) in Interest Payable, Net Billings in excess of costs and earnings on uncompleted contracts Increase (Decrease) in Contract with Customer, Liability Income tax receivable and payable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by (used in) operating activities from continuing operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Cash paid for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Proceeds from sale of assets Proceeds from Sale of Other Assets, Investing Activities Capital expenditures Payments for (Proceeds from) Productive Assets Net cash provided by (used in) investing activities from continuing operations Net Cash Provided by (Used in) Investing Activities, Continuing Operations Financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Proceeds from the issuance of long-term debt Proceeds from Issuance of Long-term Debt Extinguishment of long-term debt Repayments of Long-term Debt Proceeds (expenses) from the issuance of common stock Payments of Stock Issuance Costs Repayment under credit facility and debt Repayments of Long-term Lines of Credit Debt issuance costs Payments of Debt Issuance Costs Payments under finance leases Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised Other Proceeds from (Payments for) Other Financing Activities Net cash provided by financing activities from continuing operations Net Cash Provided by (Used in) Financing Activities Net cash flows of continuing operations Net Cash Provided by (Used in) Continuing Operations Net operating cash flows of discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Net investing cash flows of discontinued operations Cash Provided by (Used in) Investing Activities, Discontinued Operations Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, cash equivalents and restricted cash at beginning of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of year Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid during the year for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Net cash paid during the year for income taxes Income Taxes Paid, Net Non-cash financing and investing activities: Noncash Investing and Financing Items [Abstract] Capital expenditures included in accounts payable and accrued expenses Capital Expenditures Incurred but Not yet Paid Liability for contingent consideration and goodwill related to acquisition Business Combination, Contingent Consideration, Liability Operating lease liabilities arising from obtaining right-of-use assets, including impact of ASC 842 adoption Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Finance lease liabilities arising from obtaining right-of-use assets, including impact of ASC 842 adoption Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term [Abstract] Operating leases Operating Lease, Weighted Average Remaining Lease Term Finance leases Finance Lease, Weighted Average Remaining Lease Term Weighted Average Discount Rate, Percent [Abstract] Weighted Average Discount Rate, Percent [Abstract] Weighted Average Discount Rate, Percent [Abstract] Operating leases Operating Lease, Weighted Average Discount Rate, Percent Finance leases Finance Lease, Weighted Average Discount Rate, Percent Public Safety & Security Public Safety and Security [Member] Public Safety and Security [Member] Disposal Group, Held-for-sale Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Income Statement Location [Axis] Income Statement Location [Domain] Purchase price, in cash Disposal Group, Including Discontinued Operation, Consideration Working capital adjustments Disposal Group, Including Discontinued Operation, Working Capital Adjustment Disposal Group, Including Discontinued Operation, Working Capital Adjustment Proceeds from divestiture Proceeds from Divestiture of Businesses Gain from tax liability Disposal Group, Including Discontinued Operation, Gain From Tax Liability Disposal Group, Including Discontinued Operation, Gain From Tax Liability Cost adjustments Disposal Group, Including Discontinued Operation, Impact On Revenue Of Project Cost Adjustments Disposal Group, Including Discontinued Operation, Impact On Revenue Of Project Cost Adjustments Transaction-related costs Disposal Group, Including Discontinued Operation, Transaction Related Cost Disposal Group, Including Discontinued Operation, Transaction Related Cost Depreciation and amortization expense Disposal Group, Including Discontinued Operation, Depreciation and Amortization Income tax expense (benefit) reclassification Discontinued Operation, Reclassification Of Tax Effect of Discontinued Operation Discontinued Operation, Reclassification Of Tax Effect of Discontinued Operation