Inventory Disclosure [Abstract] Inventoried Costs Inventory Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Leases [Abstract] Leases Lessee, Finance Leases [Text Block] Leases Lessee, Operating Leases [Text Block] 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 Inventory, Net of Allowances, Customer Advances and Progress Billings 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 Noncontrolling Interest [Abstract] Redeemable Noncontrolling Interest Noncontrolling Interest Disclosure [Text Block] Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [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] FTT FTT Inc [Member] FTT Inc [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Cash paid Payments to Acquire Businesses, Net of Cash Acquired Deferred purchase consideration Business Combination, Consideration Transferred, Liabilities Incurred Common stock issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Total Business Combination, Consideration Transferred, Gross Business Combination, Consideration Transferred, Gross Less: Cash acquired Cash Acquired from Acquisition Total consideration Business Combination, Consideration Transferred Income Tax Disclosure [Abstract] Federal annual utilization of NOL carryforwards limit, next five years Operating Loss Carryforwards, Federal Annual Utilization Limit, Five Years Succeeding Initial Ownership Change Operating Loss Carryforwards, Federal Annual Utilization Limit, Five Years Succeeding Initial Ownership Change Threshold period for change in allowed annual amount of NOL to be recognized Threshold Period for Change in Allowed Annual Amount of Operating Loss Carryforward to be Recognized Threshold Period for Change in Allowed Annual Amount of Operating Loss Carryforward to be Recognized Federal annual utilization of NOL carryforwards limit, after year five Operating Loss Carryforwards, Federal Annual Utilization Limit, After Year Five Operating Loss Carryforwards, Federal Annual Utilization Limit, After Year Five Unrecognized tax benefits that if recognized would impact the effective tax rate for continuing operations Unrecognized Tax Benefits that Would Impact Effective Tax Rate Increase resulting from current period tax positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Expense for interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Liabilities for uncertain tax positions believed to be reasonably possible to expire within twelve months Decrease in Unrecognized Tax Benefits is Reasonably Possible Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] 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 (in years): 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: 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 Schedule of Goodwill [Table] Schedule of Goodwill [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Kratos Government Solutions Kratos Government Solutions [Member] Kratos Government Solutions operating/reportable segment Unmanned Systems Kratos Unmanned Systems [Member] Kratos Unmanned Systems [Member] Goodwill [Line Items] Goodwill [Line Items] Gross value Goodwill, Gross Less accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Net Goodwill 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] Public Safety & Security Public Safety and Security [Member] Public Safety and Security [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Disposal Group, Held-for-sale, Not Discontinued Operations Disposal Group, Held-for-sale, Not Discontinued Operations [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] Purchase price, in cash Disposal Group, Including Discontinued Operation, Consideration Working capital adjustment Disposal Group, Including Discontinued Operation, Working Capital Adjustment Disposal Group, Including Discontinued Operation, Working Capital Adjustment Working capital retained Divestiture of Businesses, Working Capital Retained Divestiture of Businesses, Working Capital Retained Herley Herley Industries Inc [Member] Herley Industries Inc [Member] Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] 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 Loss from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax Income tax expense Discontinued Operation, Tax Effect of Discontinued Operation Loss from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Assets acquired and liabilities assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Consideration paid Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block] Pro forma information Business Acquisition, Pro Forma Information [Table Text Block] Cover [Abstract] Document Type Document Type Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date 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 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 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 Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag 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] Segment Reporting [Abstract] Number of reportable segments Number of Reportable Segments FTT Merger and acquisition expenses Business Combination, Acquisition Related Costs Revenue from Contract with Customer [Abstract] Revenue Recognition Revenue from Contract with Customer [Text Block] Risks and Uncertainties [Abstract] Significant Customers Concentration Risk Disclosure [Text Block] 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] Income Taxes Income Tax Disclosure [Text Block] 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 United States Government [Member] United States Government [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Government contracts Government Contracts Concentration Risk [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue Revenue Benchmark [Member] Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Sales to the U.S. Government, amount Revenues Sales to the U.S. Government, percentage of total revenue (percent) Concentration Risk, Percentage Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Kratos Government Solutions 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] International Non-US Government [Member] Non-US Government [Member] U.S. Commercial and other customers US Commercial [Member] US Commercial [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total Revenues Revenue from Contract with Customer, Excluding Assessed Tax Schedule of segment revenues, depreciation and amortization, and operating income (loss) Schedule of Segment Reporting Information, by Segment [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Fiscal Year Fiscal Period, Policy [Policy Text Block] Accounting Estimates Use of Estimates, Policy [Policy Text Block] Accounting Standards Updates New Accounting Pronouncements, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Net Income (Loss) per Common Share Earnings Per Share, Policy [Policy Text Block] Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Loss from discontinued operations Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile income from continuing operations to net cash provided by operating activities from continuing operations: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization 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 Deferred income taxes Deferred Income Tax Expense (Benefit) Amortization of deferred financing costs Amortization of Deferred Charges Provision for doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal) 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 and other assets Increase (Decrease) in Prepaid Expense and Other 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 Advance payments received on contracts Increase (Decrease) In Customer Advances1 Increase (Decrease) In Customer Advances1 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 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 Capital expenditures Payments to Acquire Productive Assets Net cash used in investing activities from continuing operations Net Cash Provided by (Used in) Investing Activities Financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Payments under finance leases Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan Proceeds from Issuance or Sale of Equity 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 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 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 period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of period FTT Inc Florida Turbine Technologies, Inc. [Member] Florida Turbine Technologies, Inc. [Member] FTT Core FTT Core, LLC [Member] FTT Core, LLC [Member] Technical Directions, Inc. Technical Directions, Inc. [Member] Technical Directions, Inc. [Member] 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] In-process research and development In Process Research and Development [Member] Contracts and backlog Contracts and Backlog [Member] Contracts and Backlog [Member] Trade names Trade Names [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock Common Stock [Member] Percentage of voting interests acquired Business Acquisition, Percentage of Voting Interests Acquired Aggregate purchase price Total cash 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 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 Number of shares issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Shares issued Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Payments for previous acquisition Payments for Previous Acquisition Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Intangible assets acquired Finite-lived Intangible Assets Acquired Useful life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Deferred tax liabilities Deferred Tax Liabilities, Net Revenue Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Operating income Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Earnings Per Share [Abstract] Net Income (Loss) per Common Share Earnings Per Share [Text Block] 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) Schedule of inventoried costs Schedule of Inventory, Current [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 Acquisitions Business Combination Disclosure [Text Block] Amortization of right of use assets - finance leases Finance Lease, Right-of-Use Asset, Amortization Interest on lease liabilities - finance leases Finance Lease, Interest Expense Operating lease cost (cost resulting from 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 Schedule of goodwill Schedule of Goodwill [Table Text Block] Schedule of intangible assets (finite-lived) Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of intangible assets (indefinite-lived) Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Unbilled receivables, net Unbilled Receivables, Current Inventoried costs 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 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 Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Goodwill Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets, Noncurrent Total assets 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 Billings In Excess Of Cost1 Billings In Excess Of Cost1 Current portion of operating lease liabilities Operating Lease, 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, Including Deferred Income Tax Liabilities, Net Liabilities, Current, Including Deferred Income Tax Liabilities, Net Long-term debt Long-term Debt, Excluding Current Maturities Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent 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 14) Commitments and Contingencies Redeemable noncontrolling interest Redeemable Noncontrolling Interest, Equity, Carrying Amount Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at March 29, 2020 and December 29, 2019 Preferred Stock, Value, Issued Common stock, $0.001 par value, 195,000,000 shares authorized; 106,960,828 and 106,635,508 shares issued and outstanding at March 29, 2020 and December 29, 2019, 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 Retained Earnings (Accumulated Deficit) Total stockholders’ equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and stockholders’ equity Liabilities and Equity 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) Pro forma net income attributable to Kratos Net Income (Loss) Attributable to Parent Basic pro forma income per share attributable to Kratos (USD per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Diluted pro forma income per share attributable to Kratos (USD per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Accounts receivable, net Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net 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 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 Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] 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] Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Principal Debt Instrument, Face Amount 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 Debt outstanding Long-term Debt 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] 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 Principal Carrying Amount Fair Value Long-term Debt, Fair Value Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Developed technology and technical know-how Developed Technology Rights [Member] Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Trade names 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 Net Value Finite-Lived Intangible Assets, Net Indefinite-lived trade names Indefinite-lived Intangible Assets (Excluding Goodwill) Total intangible assets: gross value Intangible Assets (Excluding Goodwill), Gross Intangible Assets (Excluding Goodwill), Gross Total intangible assets: net value Aggregate amortization expense for finite-lived intangible assets Amortization of Intangible Assets Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Redeemable Noncontrolling Interest Noncontrolling Interest [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Accumulated Deficit Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Redeemable Noncontrolling Interest Increase (Decrease) in Temporary Equity [Roll Forward] Balance, beginning of period Net income (loss) Changes in noncontrolling interest Noncontrolling Interest, Increase from Business Combination Balance, end of period Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of period (in shares) Common Stock, Shares, Outstanding Balance, beginning of period Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Issuance of common stock for employee stock 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 Net income (loss) Other comprehensive income, net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Balance, end of period (in shares) Balance, end of period Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] Subsidiary percent owned Noncontrolling Interest, Ownership Percentage by Parent Noncontrolling interest owned Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Operating Leases Lessee, Operating Lease, Liability, Payment, Due [Abstract] 2020 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 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, Remainder of Fiscal Year 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 Schedule of discontinued operations, income statement and balance sheet Disposal Groups, Including Discontinued Operations [Table Text Block] Carrying amounts and estimated fair value of long-term debt Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Income Statement [Abstract] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Service revenues Service [Member] Product sales Product [Member] Total revenues Total costs Cost of Goods and Services Sold Gross profit Gross Profit Selling, general and administrative expenses Selling, General and Administrative Expense Research and development expenses Research and Development Expense Restructuring expenses and other Impairment Charges And Adjustments To Unused Office Space Liability Impairment Charges And Adjustments To Unused Office Space Liability Operating income from continuing operations Operating Income (Loss) Other expense: Other Nonoperating Income (Expense) [Abstract] Interest expense, net Interest Income (Expense), Nonoperating, Net Other 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 Benefit for income taxes from continuing operations Income Tax Expense (Benefit) Income from continuing operations Discontinued operations: Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Loss from operations of discontinued component Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Income tax expense Less: Net income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Net income (loss) attributable to Kratos Basic income (loss) per common share attributable to Kratos: Earnings Per Share, Basic and Diluted [Abstract] Income from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic and Diluted Share Loss from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share Net income per common share (in dollars per share) Earnings Per Share, Basic and Diluted Diluted income (loss) per common share attributable to Kratos: Earnings Per Share, Diluted [Abstract] Income from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share 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: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Net income (loss) (from above) Change in cumulative translation adjustment Comprehensive income 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 attributable to Kratos Comprehensive Income (Loss), Net of Tax, Attributable to Parent Debt Debt Disclosure [Text Block] Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Revenue recognized Contract with Customer, Liability, Revenue Recognized Revenue Recognition, Milestone Method [Table] Revenue Recognition, Milestone Method [Table] Billing Status, Type [Axis] Billing Status, Type [Axis] Receivables Billing Status [Domain] Receivables Billing Status [Domain] Unbilled Revenues Unbilled Revenues [Member] T for C T for C [Member] T for C [Member] International Customer International Customer [Member] International Customer [Member] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Operating Leases: Operating Lease, Assets And Liabilities, Lessee [Abstract] Operating Lease, Assets And Liabilities, Lessee [Abstract] Operating lease right-of-use assets Current portion of operating lease liabilities Operating lease liabilities, net of current portion Finance leases: Finance Lease, Assets And Liabilities, Lessee [Abstract] Finance Lease, Assets And Liabilities, Lessee [Abstract] Property, plant and equipment, net Finance Lease, Right-of-Use Asset Other current liabilities Finance Lease, Liability, Current Other long-term liabilities Finance Lease, Liability, Noncurrent Income tax expense (benefit) at federal statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State and foreign taxes, net of federal tax benefit and valuation allowance Income Tax Reconciliation State Income Taxes And Foreign Income Tax Rate Differential Current State And Foreign Tax Expense Benefit Release of valuation allowance due to acquisitions Income Tax Rate Reconciliation, Acquisition Income Tax Rate Reconciliation, Acquisition Nondeductible expenses and other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Impact of deferred tax liabilities for indefinite-lived assets Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Increase (decrease) in reserves for uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Increase (decrease) in federal valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Benefit for income taxes from continuing operations Reconciliation of income tax benefit at statutory rate to income tax provision Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Segment Information Segment Reporting Disclosure [Text Block] Preferred Stock: Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Shares authorized (in shares) Preferred Stock, Shares Authorized 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) 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] Reportable Segments Operating Segments [Member] Corporate activities Corporate, Non-Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Depreciation & amortization: Depreciation, Depletion and Amortization, Nonproduction [Abstract] Total depreciation and amortization Operating income from continuing operations: Operating Income (Loss) [Abstract] Total operating income from continuing operations Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Letter of Credit Letter of Credit [Member] Swing Line Loan Swing Line Loan [Member] Swing Line Loan [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Federal Funds Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] LIBOR rate London Interbank Offered Rate (LIBOR) [Member] Base Rate Base Rate [Member] Eurodollar Rate Eurodollar [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Maturity period Debt Instrument, Maturity Period Debt Instrument, Maturity Period Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Potential maximum borrowing capacity, subject to Lender approval Line Of Credit Facility, Maximum Possible Borrowings Subject To Application And Bank Approval Line Of Credit Facility, Maximum Possible Borrowings Subject To Application And Bank Approval Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Fixed charge coverage ratio Debt Instrument Fixed Charge Coverage Ratio Line Of Credit Facility Fixed Coverage Ratio Outstanding borrowings Long-term Line of Credit Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Unamortized debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net