FTT Inc Florida Turbine Technologies, Inc. [Member] Florida Turbine Technologies, Inc. [Member] Customer [Domain] Customer [Domain] Letter of Credit Letter of Credit [Member] Net Income (Loss) per Common Share Earnings Per Share, Policy [Policy Text Block] Net income (loss) attributable to Kratos Net income (loss) Net Income (Loss) Attributable to Parent Entity Emerging Growth Company Entity Emerging Growth Company Operating lease right-of-use assets Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Basic pro forma loss per share (USD per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Shares outstanding (in shares) Preferred Stock, Shares Outstanding Accrued compensation Employee-related Liabilities, Current Statistical Measurement [Domain] Statistical Measurement [Domain] Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Merger and acquisition expenses Business Combination, Acquisition Related Costs Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Unbilled receivables Increase (Decrease) in Contract with Customer, Asset Purchase price, in cash Disposal Group, Including Discontinued Operation, Consideration Proceeds from sale of assets Proceeds from Sale of Property, Plant, and Equipment Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Schedule of net contract assets (liabilities) Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Additional paid-in capital Additional Paid in Capital, Common Stock Entity Filer Category Entity Filer Category Operating leases Operating Lease, Weighted Average Remaining Lease Term Other assets Other Assets, Noncurrent FTT FTT Inc [Member] FTT Inc [Member] Segments [Axis] Segments [Axis] In-process research and development In Process Research and Development [Member] 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 Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Common Stock: Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Thereafter Lessee, Operating Lease, Liability, Payments, Due After Year Four Lessee, Operating Lease, Liability, Payments, Due After Year Four Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Operating income from continuing operations: Operating Income (Loss) [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Aggregate amortization expense for finite-lived intangible assets Amortization of Intangible Assets Schedule of Revenue by Major Customers, by Reportiing Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Useful life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Variable lease cost (cost excluded from lease payments) Variable Lease, Cost Operating leases Operating Lease, Weighted Average Discount Rate, Percent Antidilutive securities excluded from computation of EPS (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of inventoried costs Schedule of Inventory, Current [Table Text Block] Revenue recognized Contract with Customer, Liability, Revenue Recognized Operating income Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Business Combination and Asset Acquisition [Abstract] Business Acquisition [Axis] Business Acquisition [Axis] Disposal Group Name [Axis] Disposal Group Name [Axis] Accrued interest Increase (Decrease) in Interest Payable, Net Schedule of intangible assets (indefinite-lived) Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Credit Facility [Domain] Credit Facility [Domain] Schedule of business acquisitions by acquisition, contingent consideration Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block] Assets Assets [Abstract] Less accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Finance lease liabilities arising from obtaining right-of-use assets Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Liabilities for uncertain tax positions believed to be reasonably possible to expire within twelve months Decrease in Unrecognized Tax Benefits is Reasonably Possible Sales to the U.S. Government, percentage of total revenue (percent) Concentration Risk, Percentage Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at September 26, 2021 and December 27, 2020 Preferred Stock, Value, Issued Kratos Government Solutions KGS Kratos Government Solutions [Member] Kratos Government Solutions operating/reportable segment Entity Address, City or Town Entity Address, City or Town Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Trade names Trade names Trade Names [Member] Accumulated Deficit Retained Earnings [Member] Debt Instrument [Axis] Debt Instrument [Axis] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Subsidiary percent owned Noncontrolling Interest, Ownership Percentage by Parent Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] 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 Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Accounts receivable Increase (Decrease) in Accounts Receivable Business combination, provisional information, initial accounting incomplete, adjustment, consideration transferred Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred Income tax benefit Discontinued Operation, Tax Effect of Discontinued Operation Operating lease liabilities arising from obtaining right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Inventoried costs Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Accrued interest Debt Instrument, Increase, Accrued Interest Business acquisition, pro forma information Business Acquisition, Pro Forma Information [Table Text Block] 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 Nondeductible expenses and other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Israeli NIS Prime Interest Israeli NIS Prime Interest [Member] Israeli NIS Prime Interest Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Payments under finance leases Finance lease - financing cash flows Finance Lease, Principal Payments Entity Interactive Data Current Entity Interactive Data Current Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Net income per common share (in dollars per share) Earnings Per Share, Basic Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Three Revenue Recognition Revenue from Contract with Customer [Text Block] Sublease income Sublease Income Finance leases: Finance Lease, Assets And Liabilities, Lessee [Abstract] Finance Lease, Assets And Liabilities, Lessee [Abstract] 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 Less: Cash acquired Cash Acquired from Acquisition Document Type Document Type Prepaid expenses Prepaid Expense, Current Schedule of disaggregation of revenue Disaggregation of Revenue [Table Text Block] Diluted income (loss) per common share attributable to Kratos: Earnings Per Share, Diluted [Abstract] Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Entity Current Reporting Status Entity Current Reporting Status Operating lease - operating cash flows (fixed payments) Operating Lease, Payments Deferred tax liabilities Deferred Tax Liabilities, Net T for C T for C [Member] T for C [Member] Weighted-average discount rate: Weighted Average Discount Rate, Percent [Abstract] Weighted Average Discount Rate, Percent [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Aggregate purchase price Business Combination, Consideration Transferred Provision for (recovery of) doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal) Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Swing Line Loan Swing Line Loan [Member] Swing Line Loan [Member] Income from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Carrying Amount Long-term Debt Property, plant and equipment, net Finance Lease, Right-of-Use Asset, after Accumulated Amortization Operating lease liabilities Increase (Decrease) In Operating Lease Liabilities Increase (Decrease) In Operating Lease Liabilities Document Transition Report Document Transition Report Weighted average common shares outstanding: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Operating Leases Lessee, Operating Lease, Liability, Payment, Due [Abstract] Base Rate Base Rate [Member] Total liabilities and stockholders’ equity Liabilities and Equity Pending Litigation Pending Litigation [Member] Technical Directions, Inc. Technical Directions, Inc. [Member] Technical Directions, Inc. [Member] Loss from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Service revenues Service [Member] Contracts and backlog Contracts and Backlog [Member] Contracts and Backlog [Member] Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Unrecognized tax benefits that if recognized would impact the effective tax rate for continuing operations Unrecognized Tax Benefits that Would Impact Effective Tax Rate Accounts payable Increase (Decrease) in Accounts Payable Total identifiable net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Including Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Including Goodwill Operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net Income (Loss) per Common Share Earnings Per Share [Text Block] Minimum Minimum [Member] Inventoried costs Inventoried costs Inventory, Net of Allowances, Customer Advances and Progress Billings Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Gross profit Gross Profit Outstanding borrowings Long-term Line of Credit 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Less: Comprehensive income (loss) attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Selling, general and administrative expenses Selling, General and Administrative Expense Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Shares authorized (in shares) Preferred Stock, Shares Authorized Proceeds from insurance Proceeds from Insurance Settlement, Investing Activities Leases Lessee, Finance Leases [Text Block] Trading Symbol Trading Symbol Percentage of voting interests acquired Business Acquisition, Percentage of Voting Interests Acquired Current liabilities: Liabilities, Current [Abstract] Issuance of common stock for cash Stock Issued During Period, Value, New Issues Cash paid for acquisitions, net of cash acquired Total consideration Payments to Acquire Businesses, Net of Cash Acquired Debt Debt Disclosure [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] Senior notes Senior Notes [Member] Inventoried Costs Inventory Disclosure [Text Block] Issuance of common stock for cash (in shares) Stock Issued During Period, Shares, New Issues Number of reportable segments Number of Reportable Segments Total present value of lease liabilities Operating Lease, Liability Redeemable noncontrolling interest Redeemable Noncontrolling Interest, Equity, Carrying Amount Common stock, $0.001 par value, 195,000,000 shares authorized; 123,986,345 and 123,047,147 shares issued and outstanding at September 26, 2021 and December 27, 2020, respectively Common Stock, Value, Issued Finance leases Finance Lease, Weighted Average Discount Rate, Percent Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total other expense, net Nonoperating Income (Expense) Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Commitments and contingencies Commitments and Contingencies Leases Lessee, Operating Leases [Text Block] Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Amortization of right of use assets - finance leases Finance Lease, Right-of-Use Asset, Amortization 2021 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Acquisitions Business Combination Disclosure [Text Block] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Ownership [Axis] Ownership [Axis] Document Period End Date Document Period End Date Goodwill [Line Items] Goodwill [Line Items] Pro forma net loss Business Acquisition, Pro Forma Net Income (Loss) Attributable Parent Business Acquisition, Pro Forma Net Income (Loss) Attributable Parent Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Entity Registrant Name Entity Registrant Name Restructuring expenses and other Impairment Charges And Adjustments To Unused Office Space Liability Impairment Charges And Adjustments To Unused Office Space Liability Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Net operating cash flows of discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Consideration received on transaction Sale of Stock, Consideration Received on Transaction Work in process Inventory, Work in Process, Net of Reserves Unbilled receivables, net Unbilled Receivables, Current Capital expenditures Payments to Acquire Productive Assets Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Number of shares issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Accrued expenses Accrued Liabilities, Current Total revenues Total Revenues Revenue from Contract with Customer, Excluding Assessed Tax Income tax receivable and payable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Less: imputed interest Finance Lease, Liability, Undiscounted Excess Amount Finished goods Inventory, Finished Goods, Net of Reserves International Non-US Government [Member] Non-US Government [Member] Equity [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] Common Stock Common Stock [Member] Variable Rate [Axis] Variable Rate [Axis] Other expense: Other Nonoperating Income (Expense) [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Finance leases Finance Lease, Weighted Average Remaining Lease Term Operating income Total operating income from continuing operations Operating Income (Loss) Current portion of operating lease liabilities Current portion of operating lease liabilities Operating Lease, Liability, Current Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Stock-based compensation Share-based Payment Arrangement, Noncash Expense Variable Rate [Domain] Variable Rate [Domain] Additional Paid-In Capital Additional Paid-in Capital [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Repayment of debt Repayments of Debt Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] 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 Revenue Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Stock compensation - excess tax benefits Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Other income, net Other Nonoperating Income (Expense) Fair Value Long-term Debt, Fair Value Other liabilities Increase (Decrease) in Other Operating Liabilities Other current liabilities Other Liabilities, Current Maximum Maximum [Member] U.S. Commercial and other customers US Commercial [Member] US Commercial [Member] Cost plus fee Cost Plus Fee Contract [Member] Cost Plus Fee Contract [Member] Total intangible assets: gross value Intangible Assets (Excluding Goodwill), Gross Intangible Assets (Excluding Goodwill), Gross Total liabilities Liabilities Raw materials Inventory, Raw Materials, Net of Reserves Unbilled Revenues Unbilled Revenues [Member] 7% Senior Notes due 2019 Seven Percent Senior Notes Due 2019 [Member] Seven Percent Senior Notes Due 2019 [Member] Maturities of operating lease liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Consolidation Items [Axis] Consolidation Items [Axis] Billing Status, Type [Axis] Billing Status, Type [Axis] Shares issued (in shares) Common Stock, Shares, Issued Preferred Stock: Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Restricted cash Restricted Cash and Cash Equivalents, Current Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Accrued expenses Increase (Decrease) in Other Accrued Liabilities Eurodollar Rate Eurodollar [Member] Working capital adjustment Disposal Group, Including Discontinued Operation, Working Capital Adjustment Disposal Group, Including Discontinued Operation, Working Capital Adjustment Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Reacquisition price Debt Instrument, Repurchase Amount Operating lease liabilities, net of current portion Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Total lease payments Finance Lease, Liability, Payment, Due Principal Principal Debt Instrument, Face Amount 2022 Finance Lease, Liability, to be Paid, Year One Accrued compensation Increase (Decrease) in Employee Related Liabilities Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Net assets acquired, excluding cash Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net City Area Code City Area Code Accumulated deficit Retained Earnings (Accumulated Deficit) Reportable Segments Operating Segments [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Assets acquired and liabilities assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Total present value of lease liabilities Finance Lease, Liability Business Acquisition [Line Items] Business Acquisition [Line Items] Income Statement [Abstract] Income Statement [Abstract] Amendment Flag Amendment Flag Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Diluted pro forma loss per share (USD per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 2024 Finance Lease, Liability, to be Paid, Year Three 2025 Finance Lease, Liability, to be Paid, Year Four Indefinite-lived trade names Indefinite-lived Intangible Assets (Excluding Goodwill) Proceeds from shares issued under equity plans Proceeds from Stock Options Exercised Israel Debt Israel Debt [Member] Israel Debt 6.5% Notes Six Point Five Percent Senior Secured Notes Due 2025 [Member] Six Point Five Percent Senior Secured Notes Due 2025 [Member] 2023 Finance Lease, Liability, to be Paid, Year Two Impact of deferred tax liabilities for indefinite-lived assets Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Provision (benefit) for income taxes from continuing operations Provision (benefit) for income taxes from continuing operations Income Tax Expense (Benefit) Total stockholders’ equity Balance, beginning of period Balance, end of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Proceeds from the issuance of long-term debt Proceeds from Issuance of Long-term Debt Equity Components [Axis] Equity Components [Axis] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total current assets Assets, Current Concentration Risk Type [Domain] Concentration Risk Type [Domain] Total lease payments Lessee, Operating Lease, Liability, to be Paid Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Receivables Billing Status [Domain] Receivables Billing Status [Domain] Schedule of segment revenues, depreciation and amortization, and operating income (loss) Schedule of Segment Reporting Information, by Segment [Table Text Block] Decrease in federal valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Entity File Number Entity File Number CPI ASC Signal Division, Inc. CPI ASC Signal Division, Inc. [Member] CPI ASC Signal Division, Inc. 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 Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Product and Service [Axis] Product and Service [Axis] Financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Small Business Entity Small Business Par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Amortization of deferred financing costs Amortization of Deferred Charges Revenue Revenue Benchmark [Member] Equity Component [Domain] Equity Component [Domain] Short-term lease cost Short-term Lease, Cost Decrease resulting from current period tax positions Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions Issuance of common stock for employee stock purchase plan and stock options (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture 2022 Lessee, Operating Lease, Liability, to be Paid, Year One Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Change in cumulative translation adjustment Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Disposal Group Name [Domain] Disposal Group Name [Domain] Public Safety & Security Public Safety and Security [Member] Public Safety and Security [Member] Debt issuance costs Debt Issuance Costs, Gross Statement [Line Items] Statement [Line Items] Property, plant and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Billings in excess of costs and earnings on uncompleted contracts Increase (Decrease) in Contract with Customer, Liability FTT Core FTT Core, LLC [Member] FTT Core, LLC [Member] Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Optimized Performance Machining, Inc. (OPM) Optimized Performance Machining, Inc. (OPM) [Member] Optimized Performance Machining, Inc. (OPM) Issuance of common stock for employee stock purchase plan and stock options Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Carrying amounts and estimated fair value of long-term debt Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] 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 2025 Lessee, Operating Lease, Liability, to be Paid, Year Four Debt Disclosure [Abstract] Debt Disclosure [Abstract] Time and materials Time-and-materials Contract [Member] Entity Address, State or Province Entity Address, State or Province Other current liabilities Finance Lease, Liability, Current Income from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Federal impact of research & development tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Current liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Current Revenue Recognition, Milestone Method [Table] Revenue Recognition, Milestone Method [Table] Corporate activities Corporate, Non-Segment [Member] Segment Reporting [Abstract] Segment Reporting [Abstract] Customer [Axis] Customer [Axis] Interest on lease liabilities - finance leases Finance Lease, Interest Expense Accounting Estimates Use of Estimates, Policy [Policy Text Block] Entity Shell Company Entity Shell Company Fixed charge coverage ratio Debt Instrument Fixed Charge Coverage Ratio Line Of Credit Facility Fixed Coverage Ratio Contract assets, net change Contract assets, net change Contract With Customer, Asset, Increase (Decrease) Contract With Customer, Asset, Increase (Decrease) Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Local Phone Number Local Phone Number Finance Leases Finance Lease, Liability, Payment, Due [Abstract] Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Proceeds from the issuance of common stock, net of issuance costs Proceeds from Issuance of Common Stock Total assets Assets Shares authorized (in shares) Common Stock, Shares Authorized Redeemable Noncontrolling Interest Noncontrolling Interest [Member] Research and development expenses Research and Development Expense Product and Service [Domain] Product and Service [Domain] Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Balance sheet information Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Less: Net income (loss) attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Redeemable Noncontrolling Interest Noncontrolling Interest Disclosure [Text Block] Revolving Credit Facility Revolving Credit Facility [Member] Billings in excess of costs and earnings on uncompleted contracts Billings In Excess Of Cost1 Billings In Excess Of Cost1 Expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Litigation Status [Axis] Litigation Status [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Lease cost Lease, Cost [Table Text Block] Entity Tax Identification Number Entity Tax Identification Number Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Net income per common share (in dollars per share) Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Price per share (in dollars per share) Sale of Stock, Price Per Share Product sales Product [Member] U.S. Government United States Government [Member] United States Government [Member] Net income (loss) Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Comprehensive income (loss) attributable to Kratos Comprehensive Income (Loss), Net of Tax, Attributable to Parent Intangible assets, net Total intangible assets: net value Intangible Assets, Net (Excluding Goodwill) Contract liabilities Contract with Customer, Liability Fixed price Fixed-price Contract [Member] Net cash provided by (used in) financing activities from continuing operations Net Cash Provided by (Used in) Financing Activities Expense for interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Property and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Net contract assets Contract With Customer, Asset (Liability), Net Contract With Customer, Asset (Liability), Net Income from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Loss from discontinued operations Loss from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Maturities of financing lease liabilities Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Accounts payable Accounts Payable, Current Concentration Risk Type [Axis] Concentration Risk Type [Axis] Depreciation and amortization Total depreciation and amortization Depreciation, Depletion and Amortization Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Inventoried costs Increase (Decrease) in Inventories Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Shares outstanding (in shares) Balance, beginning of period (in shares) Balance, end of period (in shares) Common Stock, Shares, Outstanding Shares issued Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Total costs Cost of Goods and Services Sold Sale of discontinued operations Proceeds from Divestiture of Businesses Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Total lease cost Lease, Cost 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] Debt instrument, term Debt Instrument, Term Customer relationships Customer Relationships [Member] Operating Leases: Operating Lease, Assets And Liabilities, Lessee [Abstract] Operating Lease, Assets And Liabilities, Lessee [Abstract] International Customer International Customer [Member] International Customer [Member] Significant Customers Concentration Risk Disclosure [Text Block] Redeemable Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] Maturity period Debt Instrument, Maturity Period Debt Instrument, Maturity Period 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 Other long-term liabilities Other Liabilities, Noncurrent Term Loan Term Loan [Member] Term Loan Net contract assets, net change Contract With Customer, Asset (Liability), Net Increase (Decrease) Contract With Customer, Asset (Liability), Net Increase (Decrease) Net cash flows of continuing operations Net Cash Provided by (Used in) Continuing Operations Fiscal Year Fiscal Period, Policy [Policy Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Contract liabilities, net change Contract liabilities, net change Contract With Customer, Liability, Increase (Decrease) Contract With Customer, Liability, Increase (Decrease) Pro forma revenues Business Acquisition, Pro Forma Revenue Noncontrolling Interest [Table] Noncontrolling Interest [Table] Release of valuation allowance due to acquisitions Income Tax Rate Reconciliation, Acquisition Income Tax Rate Reconciliation, Acquisition Stock options and awards Stock Options and Stock Awards [Member] Stock Options and Stock Awards [Member] Document Quarterly Report Document Quarterly Report Sales to the U.S. Government, amount Revenues Unmanned Systems US Kratos Unmanned Systems [Member] Kratos Unmanned Systems [Member] Expected timing of satisfaction, percentage Revenue, Remaining Performance Obligation, Percentage Premium Debt Instrument, Unamortized Premium Restricted stock issued and related taxes Restricted Stock, Value, Shares Issued Net of Tax Withholdings Line of Credit Facility [Table] Line of Credit Facility [Table] Total current liabilities Liabilities, Current, Including Deferred Income Tax Liabilities, Net Liabilities, Current, Including Deferred Income Tax Liabilities, Net Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Gross value Goodwill, Gross Long-term debt Long-term Debt, Excluding Current Maturities Schedule of Goodwill [Table] Schedule of Goodwill [Table] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Basic income (loss) per common share attributable to Kratos: Earnings Per Share, Basic and Diluted [Abstract] Noncontrolling interest owned Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Document Fiscal Period Focus Document Fiscal Period Focus Pro forma net loss before tax Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Before Tax Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Before Tax Net income (loss) Net income (loss) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Total identifiable net liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Working capital adjustments Working Capital Adjustments Working Capital Adjustments Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Number of shares issued in transaction (in shares) Sale of Stock, Number of Shares Issued in Transaction Par value (in dollars per share) Common Stock, Par or Stated Value Per Share 5-D Systems, Inc 5-D Systems, Inc [Member] 5-D Systems, Inc Member Statement of Comprehensive Income [Abstract] Current assets: Assets, Current [Abstract] Gross Value Finite-Lived Intangible Assets, Gross Interest expense, net Interest Income (Expense), Nonoperating, Net Leases [Abstract] Leases [Abstract] Acquired finite-lived intangible assets: Finite-Lived Intangible Assets, Net [Abstract] Entity Central Index Key Entity Central Index Key Schedule of intangible assets (finite-lived) Schedule of Finite-Lived Intangible Assets [Table Text Block] LIBOR rate London Interbank Offered Rate (LIBOR) [Member] Security Exchange Name Security Exchange Name Restricted stock issued and related taxes (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Disposal Group Classification [Domain] Disposal Group Classification [Domain] Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Number of loans Debt Instrument, Number Of Loans Debt Instrument, Number Of Loans 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 Income Taxes Income Tax Disclosure [Text Block] Accrued interest Interest Payable, Current Long-term liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Stockholders’ Equity – Common Stock Stockholders' Equity Note Disclosure [Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Net cash used in investing activities from continuing operations Net Cash Provided by (Used in) Investing Activities Changes in assets and liabilities, net of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Principles of Consolidation Consolidation, Policy [Policy Text Block] Payments of employee taxes withheld from share-based awards Payment, Tax Withholding, Share-based Payment Arrangement Cash paid Payments to Acquire Businesses, Gross Litigation Status [Domain] Litigation Status [Domain] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Finance lease - cash paid for interest Finance Lease, Interest Payment on Liability Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Ownership [Domain] Ownership [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Unamortized debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Net cash provided by operating activities from continuing operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Government contracts Government Contracts Concentration Risk [Member] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 2021 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Title of 12(b) Security Title of 12(b) Security Federal Funds Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Statement [Table] Statement [Table] Other current assets Other Assets, Current Number of banks Debt Instrument, Number Of Banks Debt Instrument, Number Of Banks Accounting Standards Updates New Accounting Pronouncements, Policy [Policy Text Block] Statistical Measurement [Axis] Statistical Measurement [Axis] Income tax expense at federal statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Cover [Abstract] Cover [Abstract] Thereafter Finance Lease, Liability, Payments, Due After Year Four Finance Lease, Liability, Payments, Due After Year Four Other long-term liabilities Finance Lease, Liability, Noncurrent Loss from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Net Value Finite-Lived Intangible Assets, Net Goodwill Goodwill Net Goodwill Depreciation & amortization: Depreciation, Depletion and Amortization, Nonproduction [Abstract] Balance, beginning of period Balance, end of period Stockholders' Equity Attributable to Noncontrolling Interest Income (loss) from continuing operations Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Weighted-average remaining lease term (in years): Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term [Abstract] Schedule of goodwill Schedule of Goodwill [Table Text Block] 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] Developed technology and technical know-how Developed Technology Rights [Member] Operating lease cost Operating Lease, Cost Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Loss from discontinued operations (in dollars per share) Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Basic Share Increase in reserves for uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Deferred income taxes Deferred Income Tax Expense (Benefit)