Document Type Document Type FTT Inc Florida Turbine Technologies, Inc. [Member] Florida Turbine Technologies, Inc. [Member] Other income (expense), net Other Nonoperating Income (Expense) Common Stock: Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Service revenues Service [Member] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Segments [Axis] Segments [Axis] In-process research and development In Process Research and Development [Member] Debt issuance costs Debt Issuance Costs, Gross Statistical Measurement [Domain] Statistical Measurement [Domain] Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Decrease in reserves for uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Amortization of right of use assets - finance leases Finance Lease, Right-of-Use Asset, Amortization Security Exchange Name Security Exchange Name Intangible assets, net Total intangible assets: net value Intangible Assets, Net (Excluding Goodwill) FTT FTT Inc [Member] FTT Inc [Member] Operating income Total operating income from continuing operations Operating Income (Loss) Thereafter Lessee, Operating Lease, Liability, Payments, Due After Year Four Lessee, Operating Lease, Liability, Payments, Due After Year Four Redeemable Noncontrolling Interest Noncontrolling Interest Disclosure [Text Block] Diluted pro forma income per share attributable to Kratos (USD per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Schedule of net contract assets (liabilities) Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Variable Rate [Domain] Variable Rate [Domain] Net cash provided by operating activities from continuing operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Variable Rate [Axis] Variable Rate [Axis] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Commitments and contingencies Commitments and Contingencies Total lease payments Finance Lease, Liability, Payment, Due Assets Assets [Abstract] Less: Cash acquired Cash Acquired from Acquisition Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Issuance of common stock for employee stock purchase plan, options and warrants Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Entity Address, State or Province Entity Address, State or Province Income tax at federal statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Operating lease - operating cash flows (fixed payments) Operating Lease, Payments Accounts payable Accounts Payable, Current Sublease income Sublease Income Accumulated deficit Retained Earnings (Accumulated Deficit) Operating lease right-of-use assets Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Useful life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] 2022 Lessee, Operating Lease, Liability, to be Paid, Year One 2022 Finance Lease, Liability, to be Paid, Year One Property and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 2025 Lessee, Operating Lease, Liability, to be Paid, Year Four Customer [Axis] Customer [Axis] Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at March 28, 2021 and December 27, 2020 Preferred Stock, Value, Issued Income from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Total lease cost Lease, Cost Loss from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Par value (in dollars per share) Common Stock, Par or Stated Value Per Share Other long-term liabilities Other Liabilities, Noncurrent Kratos Government Solutions KGS Kratos Government Solutions [Member] Kratos Government Solutions operating/reportable segment Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Payments under finance leases Finance lease - financing cash flows Finance Lease, Principal Payments Work in process Inventory, Work in Process, Net of Reserves Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Unbilled receivables, net Unbilled Receivables, Current Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Total revenues Total Revenues Revenue from Contract with Customer, Excluding Assessed Tax 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 Income from continuing operations Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Sales to the U.S. Government, percentage of total revenue (percent) Concentration Risk, Percentage Business Acquisition [Axis] Business Acquisition [Axis] Statement [Line Items] Statement [Line Items] 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 Basic income per common share attributable to Kratos: Earnings Per Share, Basic and Diluted [Abstract] Debt instrument, term Debt Instrument, Term Israeli NIS Prime Interest Israeli NIS Prime Interest [Member] Israeli NIS Prime Interest Accrued interest Interest Payable, Current Merger and acquisition expenses Business Combination, Acquisition Related Costs Statement [Table] Statement [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Credit Facility [Axis] Credit Facility [Axis] Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other 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 Business Combinations [Abstract] Business Combinations [Abstract] Net Income per common share (in dollars per share) Earnings Per Share, Basic and Diluted Entity Small Business Entity Small Business Operating income Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Principles of Consolidation Consolidation, Policy [Policy Text Block] Operating Leases Lessee, Operating Lease, Liability, Payment, Due [Abstract] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Number of shares issued in transaction (in shares) Sale of Stock, Number of Shares Issued in Transaction Debt Debt Disclosure [Text Block] Prepaid expenses Prepaid Expense, Current Proceeds from the issuance of common stock, net of issuance costs Proceeds from Issuance of Common Stock Amendment Flag Amendment Flag 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 Recognition, Multiple-deliverable Arrangements [Line Items] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Income tax receivable and payable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Time and materials Time-and-materials Contract [Member] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Shares issued Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Leases Lessee, Finance Leases [Text Block] Assets acquired and liabilities assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Corporate activities Corporate, Non-Segment [Member] Outstanding borrowings Long-term Line of Credit Swing Line Loan Swing Line Loan [Member] Swing Line Loan [Member] Inventoried costs Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Billing Status, Type [Axis] Billing Status, Type [Axis] Entity Central Index Key Entity Central Index Key Operating lease liabilities Increase (Decrease) In Operating Lease Liabilities Increase (Decrease) In Operating Lease Liabilities Long-term liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Carrying amounts and estimated fair value of long-term debt Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of intangible assets (finite-lived) Schedule of Finite-Lived Intangible Assets [Table Text Block] Senior notes Senior Notes [Member] Technical Directions, Inc. Technical Directions, Inc. [Member] Technical Directions, Inc. [Member] Increase in federal valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Net cash flows of continuing operations Net Cash Provided by (Used in) Continuing Operations Segments [Domain] Segments [Domain] Contracts and backlog Contracts and Backlog [Member] Contracts and Backlog [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Pro forma net loss Business Acquisition, Pro Forma Net Income (Loss) 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 Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Federal impact of research & development tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Restricted stock issued and related taxes (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Selling, general and administrative expenses Selling, General and Administrative Expense Aggregate amortization expense for finite-lived intangible assets Amortization of Intangible Assets Inventoried costs Inventoried costs Inventory, Net of Allowances, Customer Advances and Progress Billings Line of Credit Facility [Table] Line of Credit Facility [Table] Lease cost Lease, Cost [Table Text Block] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Three Other assets Other Assets, Noncurrent Segment Information Segment Reporting Disclosure [Text Block] Finance lease - cash paid for interest Finance Lease, Interest Payment on Liability Total assets Assets Title of 12(b) Security Title of 12(b) Security Disposal Group Classification [Axis] Disposal Group Classification [Axis] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Finance Leases Finance Lease, Liability, Payment, Due [Abstract] Net Value Finite-Lived Intangible Assets, Net Antidilutive Securities [Axis] Antidilutive Securities [Axis] Maturities of financing lease liabilities Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Consideration received on transaction Sale of Stock, Consideration Received on Transaction Depreciation and amortization Total depreciation and amortization Depreciation, Depletion and Amortization Reconciliation of income tax benefit at statutory rate to income tax provision Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Noncontrolling interest owned Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Product and Service [Axis] Product and Service [Axis] Total liabilities Liabilities Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Revenue recognized Contract with Customer, Liability, Revenue Recognized Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Expense for interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Inventoried costs Increase (Decrease) in Inventories Accounts payable Increase (Decrease) in Accounts Payable Raw materials Inventory, Raw Materials, Net of Reserves Debt Instrument [Axis] Debt Instrument [Axis] Additional Paid-In Capital Additional Paid-in Capital [Member] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Reportable Segments Operating Segments [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] 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] Interest on lease liabilities - finance leases Finance Lease, Interest Expense Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Restructuring expenses and other Impairment Charges And Adjustments To Unused Office Space Liability Impairment Charges And Adjustments To Unused Office Space Liability Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Shares outstanding (in shares) Balance, beginning of period (in shares) Balance, end of period (in shares) Common Stock, Shares, Outstanding Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Variable lease cost (cost excluded from lease payments) Variable Lease, Cost Revolving Credit Facility Revolving Credit Facility [Member] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Research and development expenses Research and Development Expense Cash paid for acquisitions, net of cash acquired Total consideration Payments to Acquire Businesses, Net of Cash Acquired Shares authorized (in shares) Common Stock, Shares Authorized Concentration Risk Type [Axis] Concentration Risk Type [Axis] Percentage of voting interests acquired Business Acquisition, Percentage of Voting Interests Acquired Proceeds from shares issued under equity plans Proceeds from Stock Options Exercised International Non-US Government [Member] Non-US Government [Member] Schedule of segment revenues, depreciation and amortization, and operating income (loss) Schedule of Segment Reporting Information, by Segment [Table Text Block] Accrued compensation Increase (Decrease) in Employee Related Liabilities Income Statement [Abstract] Income Statement [Abstract] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Depreciation & amortization: Depreciation, Depletion and Amortization, Nonproduction [Abstract] Operating lease liabilities, net of current portion Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Net operating cash flows of discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Unamortized debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Accounting Estimates Use of Estimates, Policy [Policy Text Block] Current assets: Assets, Current [Abstract] Investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Gross value Goodwill, Gross Comprehensive income attributable to Kratos Comprehensive Income (Loss), Net of Tax, Attributable to Parent 2024 Finance Lease, Liability, to be Paid, Year Three Par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share City Area Code City Area Code Consolidation Items [Domain] Consolidation Items [Domain] Document Period End Date Document Period End Date Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Expected timing of satisfaction, percentage Revenue, Remaining Performance Obligation, Percentage 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] Unbilled Revenues Unbilled Revenues [Member] Total intangible assets: gross value Intangible Assets (Excluding Goodwill), Gross Intangible Assets (Excluding Goodwill), Gross Net income (loss) Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Schedule of disaggregation of revenue Disaggregation of Revenue [Table Text Block] Loss from continuing operations before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Operating income from continuing operations: Operating Income (Loss) [Abstract] 7% Senior Notes due 2019 Seven Percent Senior Notes Due 2019 [Member] Seven Percent Senior Notes Due 2019 [Member] Less accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Schedule of inventoried costs Schedule of Inventory, Current [Table Text Block] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Stock-based compensation Share-based Payment Arrangement, Noncash Expense Capital expenditures Payments to Acquire Productive Assets Accrued interest Increase (Decrease) in Interest Payable, Net Payments of employee taxes withheld from share-based awards Payment, Tax Withholding, Share-based Payment Arrangement Restricted stock issued and related taxes Restricted Stock, Value, Shares Issued Net of Tax Withholdings Cover [Abstract] Cover [Abstract] Base Rate Base Rate [Member] Working capital adjustment Disposal Group, Including Discontinued Operation, Working Capital Adjustment Disposal Group, Including Discontinued Operation, Working Capital Adjustment Carrying Amount Long-term Debt Goodwill [Line Items] Goodwill [Line Items] Billings in excess of costs and earnings on uncompleted contracts Increase (Decrease) in Contract with Customer, Liability Leases Lessee, Operating Leases [Text Block] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Customer relationships Customer Relationships [Member] Total costs Cost of Goods and Services Sold Equity Components [Axis] Equity Components [Axis] Finished goods Inventory, Finished Goods, Net of Reserves Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 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 Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Minimum Minimum [Member] Property, plant and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Current portion of operating lease liabilities Current portion of operating lease liabilities Operating Lease, Liability, Current Finance lease liabilities arising from obtaining right-of-use assets Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Schedule of business acquisitions by acquisition, contingent consideration Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block] Less: Net income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Entity Interactive Data Current Entity Interactive Data Current Stockholders’ Equity – Common Stock Stockholders' Equity Note Disclosure [Text Block] 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] Amortization of deferred financing costs Amortization of Deferred Charges Customer [Domain] Customer [Domain] Fiscal Year Fiscal Period, Policy [Policy Text Block] Additional paid-in capital Additional Paid in Capital, Common Stock Entity Registrant Name Entity Registrant Name Business Acquisition [Line Items] Business Acquisition [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating leases Operating Lease, Weighted Average Discount Rate, Percent Other liabilities Increase (Decrease) in Other Operating Liabilities Number of reportable segments Number of Reportable Segments 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 Other expense: Other Nonoperating Income (Expense) [Abstract] Liabilities for uncertain tax positions believed to be reasonably possible to expire within twelve months Decrease in Unrecognized Tax Benefits is Reasonably Possible Less: imputed interest Finance Lease, Liability, Undiscounted Excess Amount Consolidation Items [Axis] Consolidation Items [Axis] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Total lease payments Lessee, Operating Lease, Liability, to be Paid Subsidiary percent owned Noncontrolling Interest, Ownership Percentage by Parent Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Public Safety & Security Public Safety and Security [Member] Public Safety and Security [Member] Basic pro forma income per share attributable to Kratos (USD per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Goodwill Net Goodwill FTT Core FTT Core, LLC [Member] FTT Core, LLC [Member] Document Transition Report Document Transition Report Optimized Performance Machining, Inc. (OPM) Optimized Performance Machining, Inc. (OPM) [Member] Optimized Performance Machining, Inc. (OPM) 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 Restricted cash Restricted Cash and Cash Equivalents, Current Principal Principal Debt Instrument, Face Amount Purchase price, in cash Disposal Group, Including Discontinued Operation, Consideration Other current assets Other Assets, Current Document Quarterly Report Document Quarterly Report Schedule of goodwill Schedule of Goodwill [Table Text Block] Equity [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] Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Credit Facility [Domain] Credit Facility [Domain] Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Fixed charge coverage ratio Debt Instrument Fixed Charge Coverage Ratio Line Of Credit Facility Fixed Coverage Ratio Letter of Credit Letter of Credit [Member] Contract assets, net change Contract With Customer, Asset, Increase (Decrease) Contract With Customer, Asset, Increase (Decrease) Unrecognized tax benefits that if recognized would impact the effective tax rate for continuing operations Unrecognized Tax Benefits that Would Impact Effective Tax Rate Entity File Number Entity File Number Debt Disclosure [Abstract] Debt Disclosure [Abstract] Operating leases Operating Lease, Weighted Average Remaining Lease Term Operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Loss from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net cash provided by (used in) financing activities from continuing operations Net Cash Provided by (Used in) Financing Activities Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Weighted average common shares outstanding: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Common stock, $0.001 par value, 195,000,000 shares authorized; 123,738,251 and 123,047,147 shares issued and outstanding at March 28, 2021 and December 27, 2020, respectively Common Stock, Value, Issued Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Disposal Group Name [Axis] Disposal Group Name [Axis] Balance sheet information Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Billings in excess of costs and earnings on uncompleted contracts Billings In Excess Of Cost1 Billings In Excess Of Cost1 Entity Current Reporting Status Entity Current Reporting Status Price per share (in dollars per share) Sale of Stock, Price Per Share 2025 Finance Lease, Liability, to be Paid, Year Four Net Income (Loss) per Common Share Earnings Per Share, Policy [Policy Text Block] Issuance of common stock for employee stock purchase plan, options and warrants (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Unbilled receivables Increase (Decrease) in Contract with Customer, Asset Balance, beginning of period Balance, end of period Stockholders' Equity Attributable to Noncontrolling Interest Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] U.S. Government United States Government [Member] United States Government [Member] Shares issued (in shares) Common Stock, Shares, Issued Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Eurodollar Rate Eurodollar [Member] Schedule of Revenue by Major Customers, by Reportiing Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Total present value of lease liabilities Operating Lease, Liability 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] Litigation Status [Axis] Litigation Status [Axis] Deferred tax liabilities Deferred Tax Liabilities, Net Long-term debt Long-term Debt, Excluding Current Maturities Segment Reporting [Abstract] Segment Reporting [Abstract] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Accounts receivable Increase (Decrease) in Accounts Receivable Debt Instrument [Line Items] Debt Instrument [Line Items] Statement of Comprehensive Income [Abstract] Current liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Current Concentration Risk Type [Domain] Concentration Risk Type [Domain] Aggregate purchase price Business Combination, Consideration Transferred Total liabilities and stockholders’ equity Liabilities and Equity Number of shares issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Income Taxes Income Tax Disclosure [Text Block] Net contract assets Contract With Customer, Asset (Liability), Net Contract With Customer, Asset (Liability), Net Entity Address, City or Town Entity Address, City or Town Income from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic and Diluted Share Accrued compensation Employee-related Liabilities, Current Business combination, provisional information, initial accounting incomplete, adjustment, consideration transferred Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred Fixed price Fixed-price Contract [Member] Operating lease cost Operating Lease, Cost Net assets acquired, excluding cash Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Total identifiable net liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Nondeductible expenses and other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Antidilutive securities excluded from computation of EPS (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Finance leases Finance Lease, Weighted Average Remaining Lease Term Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Product sales Product [Member] Short-term lease cost Short-term Lease, Cost Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets [Axis] Equity Component [Domain] Equity Component [Domain] Gross profit Gross Profit Redeemable Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] Entity Tax Identification Number Entity Tax Identification Number Interest expense, net Interest Income (Expense), Nonoperating, Net Net income (loss) attributable to Kratos Net income (loss) Net Income (Loss) Attributable to Parent Other long-term liabilities Finance Lease, Liability, Noncurrent Receivables Billing Status [Domain] Receivables Billing Status [Domain] Changes in assets and liabilities, net of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Other current liabilities Other Liabilities, Current 2021 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year LIBOR rate London Interbank Offered Rate (LIBOR) [Member] Inventoried Costs Inventory Disclosure [Text Block] Premium Debt Instrument, Unamortized Premium Trade names Trade names Trade Names [Member] Leases [Abstract] Leases [Abstract] Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Total current assets Assets, Current Current Fiscal Year End Date Current Fiscal Year End Date Less: Comprehensive income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Earnings Per Share [Abstract] Earnings Per Share [Abstract] Operating Leases: Operating Lease, Assets And Liabilities, Lessee [Abstract] Operating Lease, Assets And Liabilities, Lessee [Abstract] International Customer International Customer [Member] International Customer [Member] Total present value of lease liabilities Finance Lease, Liability Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] 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 Term Loan Term Loan [Member] Term Loan Disposal Group Name [Domain] Disposal Group Name [Domain] Net contract assets, net change Contract With Customer, Asset (Liability), Net Increase (Decrease) Contract With Customer, Asset (Liability), Net Increase (Decrease) Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Developed technology and technical know-how Developed Technology Rights [Member] Document Fiscal Period Focus Document Fiscal Period Focus Contract liabilities, net change Contract With Customer, Liability, Increase (Decrease) Contract With Customer, Liability, Increase (Decrease) 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] Unmanned Systems US Kratos Unmanned Systems [Member] Kratos Unmanned Systems [Member] Government contracts Government Contracts Concentration Risk [Member] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Total current liabilities Liabilities, Current, Including Deferred Income Tax Liabilities, Net Liabilities, Current, Including Deferred Income Tax Liabilities, Net Entity Filer Category Entity Filer Category Common Stock Common Stock [Member] Net income Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Product and Service [Domain] Product and Service [Domain] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Finance leases Finance Lease, Weighted Average Discount Rate, Percent Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity 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 Gross Value Finite-Lived Intangible Assets, Gross Revenue Revenue Benchmark [Member] Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Acquired finite-lived intangible assets: Finite-Lived Intangible Assets, Net [Abstract] Expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Provision for doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal) Working capital adjustments Working Capital Adjustments Working Capital Adjustments Diluted income per common share attributable to Kratos: Earnings Per Share, Diluted [Abstract] 5-D Systems, Inc 5-D Systems, Inc [Member] 5-D Systems, Inc 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 Acquisitions Business Combination Disclosure [Text Block] Total other expense, net Nonoperating Income (Expense) Property, plant and equipment, net Finance Lease, Right-of-Use Asset, after Accumulated Amortization Maturities of operating lease liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Accrued expenses Increase (Decrease) in Other Accrued Liabilities Stock compensation - excess tax benefits Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Preferred Stock: Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Ownership [Axis] Ownership [Axis] Change in cumulative translation adjustment Other comprehensive income, net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Ownership [Domain] Ownership [Domain] 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 Revenue Recognition Revenue from Contract with Customer [Text Block] Total stockholders’ equity Balance, beginning of period Balance, end of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Operating lease liabilities arising from obtaining right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 2021 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Sales to the U.S. Government, amount Revenues Fair Value Long-term Debt, Fair Value Benefit for income taxes from continuing operations Benefit for income taxes from continuing operations Income Tax Expense (Benefit) Sale of discontinued operations Proceeds from Divestiture of Businesses 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 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 Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Revenue Recognition, Milestone Method [Table] Revenue Recognition, Milestone Method [Table] Accrued expenses Accrued Liabilities, Current Net Income per common share (in dollars per share) Earnings Per Share, Diluted Other current liabilities Finance Lease, Liability, Current Local Phone Number Local Phone Number Cash paid Payments to Acquire Businesses, Gross Business acquisition, pro forma information Business Acquisition, Pro Forma Information [Table Text Block] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Revenue Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Schedule of intangible assets (indefinite-lived) Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Contract liabilities Contract with Customer, Liability Entity Emerging Growth Company Entity Emerging Growth Company Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Indefinite-lived trade names Indefinite-lived Intangible Assets (Excluding Goodwill) Pro forma revenues Business Acquisition, Pro Forma Revenue Deferred income taxes Deferred Income Tax Expense (Benefit) Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Maximum Maximum [Member] Federal Funds Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Shares authorized (in shares) Preferred Stock, Shares Authorized Redeemable Noncontrolling Interest Noncontrolling Interest [Member] Number of banks Debt Instrument, Number Of Banks Debt Instrument, Number Of Banks Accumulated Deficit Retained Earnings [Member] Shares outstanding (in shares) Preferred Stock, Shares Outstanding Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Net cash used in investing activities from continuing operations Net Cash Provided by (Used in) Investing Activities Significant Customers Concentration Risk Disclosure [Text Block] Pending Litigation Pending Litigation [Member] Thereafter Finance Lease, Liability, Payments, Due After Year Four Finance Lease, Liability, Payments, Due After Year Four Trading Symbol Trading Symbol Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Litigation Status [Domain] Litigation Status [Domain] Weighted-average remaining lease term (in years): Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term [Abstract] Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Net Income (Loss) per Common Share Earnings Per Share [Text Block] Reacquisition price Debt Instrument, Repurchase Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Redeemable noncontrolling interest Redeemable Noncontrolling Interest, Equity, Carrying Amount Current liabilities: Liabilities, Current [Abstract] Accrued interest Debt Instrument, Increase, Accrued Interest Financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Entity Shell Company Entity Shell Company Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] 2023 Finance Lease, Liability, to be Paid, Year Two Accounting Standards Updates New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]