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] 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 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] 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 Leases [Abstract] Leases Lessee, Finance Leases [Text Block] Leases Lessee, Operating Leases [Text Block] Revenue from Contract with Customer [Abstract] 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 Segment Reporting [Abstract] Number of reportable segments Number of Reportable Segments FTT Merger and acquisition expenses Business Combination, Acquisition Related Costs Organization, Consolidation and Presentation of Financial Statements [Abstract] FTT Inc Florida Turbine Technologies, Inc. [Member] Florida Turbine Technologies, Inc. [Member] FTT Core FTT Core, LLC [Member] FTT Core, LLC [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Subsidiaries Subsidiaries [Member] Percentage of voting interests acquired Business Acquisition, Percentage of Voting Interests Acquired Aggregate purchase price Business Combination, Consideration Transferred Subsidiary percent owned Noncontrolling Interest, Ownership Percentage by Parent Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] 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] 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] Accounts receivable, net and unbilled receivables, 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 Disposal Group, Including Discontinued Operation, Assets, Current 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 Disposal Group, Including Discontinued Operation, Liabilities, Current Long-term liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Contract assets Contract with Customer, Asset, Net 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) Inventory Disclosure [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 Subtotal inventoried costs Inventory, Net Less: Customer advances and progress payments Progress Payments Netted Against Inventory for Long-term Contracts or Programs Total inventoried costs Inventory, Net of Allowances, Customer Advances and Progress Billings 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] Statement of Financial Position [Abstract] 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) Common Stock, Shares, Outstanding 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] Inventoried Costs Inventory Disclosure [Text Block] 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 expense Disposal Group, Including Discontinued Operation, Other 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 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] Noncontrolling Interest [Abstract] Redeemable Noncontrolling Interest Noncontrolling Interest Disclosure [Text Block] Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Revenue recognized Contract with Customer, Liability, Revenue Recognized Noncontrolling Interest [Table] Noncontrolling Interest [Table] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Increase in minority interest purchase price over next 12 months Increase In Minority Interest Purchase Price Over Next 12 Months Increase In Minority Interest Purchase Price Over Next 12 Months Payments for redeemable noncontrolling interest Redeemable Noncontrolling Interest, Equity, Redemption Value Income Tax Disclosure [Abstract] Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] Effective Income Tax Rate Reconciliation, Amount [Abstract] Income tax expense 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 FTT acquisition Income Tax Rate Reconciliation, Acquisition Income Tax Rate Reconciliation, Acquisition GILTI Income Tax Reconciliation, Global Intangible Low-Taxed Income Income Tax Reconciliation, Global Intangible Low-Taxed Income 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 in reserves for uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Decrease in federal valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Total income tax benefit (provision) Income Tax Expense (Benefit) Acquisition Business Combination Disclosure [Text Block] 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] Debt Disclosure [Abstract] Principal Debt Instrument, Face Amount Carrying Amount Long-term Debt Fair Value Long-term Debt, Fair Value Unamortized debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Schedule of Segment Revenues, Depreciation and Amortization, and Operating Income (Loss) Schedule of Segment Reporting Information, by Segment [Table Text Block] 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] 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 Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities Intangible assets acquired Finite-lived Intangible Assets Acquired Useful life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 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 Amortization of intangible assets Business Acquisition, Pro Forma Amortization Of Intangible Assets Business Acquisition, Pro Forma Amortization Of Intangible Assets Schedule of Discontinued Operations, Income Statement and Balance Sheet Disposal Groups, Including Discontinued Operations [Table Text Block] Operating Leases Operating Lease Liabilities, Payments Due [Abstract] 2019 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 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 Liabilities, Payments, Due [Abstract] 2019 Finance Lease, Liability, Payments, Remainder of Fiscal Year 2020 Finance Lease, Liability, Payments, Due Year Two 2021 Finance Lease, Liability, Payments, Due Year Three 2022 Finance Lease, Liability, Payments, Due Year Four 2023 Finance Lease, Liability, Payments, Due Year Five Thereafter Finance Lease, Liability, Payments, Due after Year Five Total lease payments Finance Lease, Liability, Payments, Due Less: imputed interest Finance Lease, Liability, Undiscounted Excess Amount Total present value of lease liabilities Finance Lease, Liability 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 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 Disaggregation of Revenue [Table] Disaggregation of Revenue [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] 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] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] 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 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 Goodwill and Intangible Assets Disclosure [Abstract] 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] Segment Information Segment Reporting Disclosure [Text Block] Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net income (loss) attributable to Kratos Less: 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 Compensation Deferred income taxes Deferred Income Tax Expense (Benefit) Amortization of deferred financing costs Amortization of Deferred Charges 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 compensation Increase (Decrease) in Employee Related Liabilities Accrued expenses Increase (Decrease) in Other Accrued Liabilities Advance payments received on contracts Increase (Decrease) in Customer Advances 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 Payments to Acquire Businesses, Net of Cash Acquired Capital expenditures Payments for (Proceeds from) Productive Assets Net cash 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] Debt issuance costs Payments of Debt Issuance Costs Proceeds (use) from the issuance of common stock Proceeds from Issuance of Common Stock Repayment of debt Repayments of Long-term Lines of Credit Payments under finance leases Finance Lease, Principal Payments Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan Proceeds from (Repurchase of) Equity Net cash provided by financing activities from continuing operations Net Cash Provided by (Used in) Financing Activities, Continuing Operations 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 Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Finance lease - cash paid for interest Finance Lease, Interest Payment on Liability Fair value of assets acquired Cash purchase consideration Common stock issued Deferred purchase consideration Business Combination, Consideration Transferred, Liabilities Incurred Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [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] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Reportable Segments Operating Segments [Member] Unallocated corporate expense, net Corporate, Non-Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Total revenues 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 Operating Income (Loss) Risks and Uncertainties [Abstract] Significant Customers Concentration Risk Disclosure [Text Block] 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] 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 Intangible Assets, Net (Excluding Goodwill) Aggregate amortization expense for finite-lived intangible assets Amortization of Intangible Assets Operating lease right-of-use assets obtained in exchange for new lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Finance lease right-of-use assets obtained in exchange for new lease liabilities 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 Income Statement [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] 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 Unused office space, 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 Other income (expense): Other Nonoperating Income (Expense) [Abstract] Interest expense, net Interest Income (Expense), Nonoperating, Net Other income (expense), net Other Nonoperating Income (Expense) Total other expense, net Nonoperating Income (Expense) Income 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 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 benefit (provision) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Less: Net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Basic income (loss) per common share attributable to Kratos: Earnings Per Share, Basic and Diluted [Abstract] Net income from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic and Diluted Share Net 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 loss 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] Net income from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Net 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 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 (shares) Weighted Average Number of Shares Outstanding, Basic Diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Comprehensive Income (Loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Net income (loss) Change in cumulative translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive loss 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 Public Safety & Security Public Safety and Security [Member] Public Safety and Security [Member] Disposal Group, Held-for-sale, Not Discontinued Operations Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Selling, General and Administrative Expenses Selling, General and Administrative Expenses [Member] 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 Proceeds from divestiture Proceeds from Divestiture of Businesses Working capital retained Divestiture of Businesses, Working Capital Retained Divestiture of Businesses, Working Capital Retained Transaction costs Disposal Group, Including Discontinued Operation, Transaction Costs Disposal Group, Including Discontinued Operation, Transaction Costs Impact of revenue Disposal Group, Including Discontinued Operation, Impact On Revenue Of Project Cost Adjustments Disposal Group, Including Discontinued Operation, Impact On Revenue Of Project Cost Adjustments Impact of operating results Disposal Group, Including Discontinued Operation, Impact On Operating Income (Loss) Of Project Cost Adjustments Disposal Group, Including Discontinued Operation, Impact On Operating Income (Loss) 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 Disposal Group, Including Discontinued Operation, Depreciation and Amortization 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 Goodwill 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 Statement of Stockholders' Equity [Abstract] 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 Income (Loss) AOCI Attributable to Parent [Member] Accumulated Deficit Retained Earnings [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] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Balance, beginning of period Redeemable Noncontrolling Interest, Equity, Carrying Amount Changes in noncontrolling interest Temporary Equity, Carrying Amount, Period Increase (Decrease) Balance, end of period Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of period (in shares) Balance, beginning of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Impact from the adoption of ASC 606 Cumulative Effect of New Accounting Principle in Period of Adoption Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Issuance of common stock for employee stock purchase plan, options and warrants (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Issuance of common stock for employee stock purchase plan, options and warrants Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures 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 (loss), net of tax Balance, end of period (in shares) Balance, end of period Finance lease - financing cash flows Operating lease - operating cash flows (fixed payments) Operating Lease, Payments Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Gross value Goodwill, Gross Less accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Net 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] 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 Revenue Recognition Revenue from Contract with Customer [Text Block] 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 Federal Funds Effective Swap Rate [Member] LIBOR rate London Interbank Offered Rate (LIBOR) [Member] Base Rate Base Rate [Member] Eurodollar Rate Eurodollar [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Maturity period Debt Instrument, Maturity Period Debt Instrument, Maturity Period 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 Outstanding borrowings Long-term Line of Credit Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Fixed charge coverage ratio Debt Instrument Fixed Charge Coverage Ratio Line Of Credit Facility Fixed Coverage Ratio Debt Debt Disclosure [Text Block] Net Income (Loss) per Common Share Earnings Per Share [Text Block] 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 minimum lease payments Operating Leases, Future Minimum Payments Due Income Taxes Income Tax Disclosure [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] Finance lease Renewal term Lessee, Finance Lease, Renewal Term Rent expense Operating Leases, Rent Expense, Net Sublease income Operating Leases, Income Statement, Sublease Revenue Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Schedule of Inventoried Costs Schedule of Inventory, Current [Table Text Block] Schedule of Revenue by Major Customers, by Reportiing Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] 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 Sales Revenue, Net [Member] U.S. Government U.S. Government [Member] U.S. Government, major customer [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 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 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, Net, 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 Total current assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Operating lease right-of-use assets Intangible assets, net 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 Cost Current portion of operating lease liabilities Other current liabilities Other Liabilities, Current Current liabilities of discontinued operations Total current liabilities Liabilities, Current Long-term debt principal, net of current portion Long-term Debt, Excluding Current Maturities Operating lease liabilities, net of current portion Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Redeemable noncontrolling interest (Note 12) Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at March 31, 2019 and December 30, 2018 Preferred Stock, Value, Issued Common stock, $0.001 par value, 195,000,000 shares authorized; 105,885,792 and 103,766,899 shares issued and outstanding at March 31, 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 Retained Earnings (Accumulated Deficit) Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Carrying Amounts and Estimated Fair Value of Long-Term Debt Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Reconciliation of Income Tax Benefit at Statutory Rate to Income Tax Provision Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] 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 Document And Entity Information -- None. No documentation exists for this element. -- Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type 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 Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 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