Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stockholders' Equity Shareholders' Equity and Share-based Payments [Text Block] Weighted average grant date fair value of options granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Total intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [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] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of period (in shares) Common Stock, Shares, Outstanding Balance, beginning of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Impact from the adoption of ASC 606 (Note 1) 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 cash (in shares) Stock Issued During Period, Shares, New Issues Issuance of common stock for cash Stock Issued During Period, Value, New Issues 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 Net income (loss) Net Income (Loss) Attributable to Parent Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Balance, end of period (in shares) Balance, end of period Segment Reporting [Abstract] 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 Service [Member] Product Product [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Corporate activities Segment Reconciling Items [Member] 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] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Discontinued Operations [Member] Discontinued Operations [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Total revenues Revenue from Contract with Customer, Excluding Assessed Tax Depreciation and amortization Depreciation, Depletion and Amortization Total operating income (loss) from continuing operations Operating Income (Loss) Total assets Assets Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] FTT Core, LLC FTT Core, LLC [Member] FTT Core, LLC [Member] Florida Turbine Technologies, Inc. Florida Turbine Technologies, Inc. [Member] Florida Turbine Technologies, Inc. [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Percentage of voting interests acquired Business Acquisition, Percentage of Voting Interests Acquired Purchase price Business Combination, Consideration Transferred Cash Payments to Acquire Businesses, Gross Common stock value Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Statement of Financial Position [Abstract] Preferred Stock: Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Par value (usd per share) Preferred Stock, Par or Stated Value Per Share Shares authorized (in shares) Preferred Stock, Shares Authorized Shares outstanding (in shares) Preferred Stock, Shares Outstanding Common Stock: Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Par value (in dollars per share) Common Stock, Par or Stated Value Per Share Shares authorized (in shares) Common Stock, Shares Authorized Shares issued (in shares) Common Stock, Shares, Issued Shares outstanding (in shares) Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Table] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] Balances Without Adoption of ASC 606 Calculated under Revenue Guidance in Effect before Topic 606 [Member] Effect of Change Higher/(Lower) Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Total costs Cost of Goods and Services Sold Gross profit Gross Profit Selling, general and administrative expenses Selling, General and Administrative Expense Operating income from continuing operations Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Herley Herley Industries Inc [Member] Herley Industries Inc [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Revenue Disposal Group, Including Discontinued Operation, Revenue Cost of sales Disposal Group, Including Discontinued Operation, Costs of Goods Sold Selling, general and administrative expenses Disposal Group, Including Discontinued Operation, General and Administrative Expense Other net income (expense) items that are not major Disposal Group, Including Discontinued Operation, Other (Income) Expense Disposal Group, Including Discontinued Operation, Other (Income) Expense Income (loss) from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax Gain on disposal of discontinued operations before income taxes Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Total gain (loss) of discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Income tax expense (benefit) Discontinued Operation, Tax Effect of Discontinued Operation Income (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Retirement Benefits [Abstract] Retirement Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Leases [Abstract] Sublease income on operating leases Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals Operating Leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years 2023 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total future minimum lease payments Operating Leases, Future Minimum Payments Due Gross rent expense under operating leases Operating Leases, Rent Expense, Minimum Rentals Sublease income Operating Leases, Rent Expense, Sublease Rentals Accrual for excess facilities Accrual for Unused Facilities [Roll Forward] Accrual for Unused Facilities [Roll Forward] Accrual for excess facilities - beginning balance Accrual for Unused Facilities Accrual for Unused Facilities Adjustment of excess facility accrual Accrual for Unused Facilities, Accrual Adjustment Accrual for Unused Facilities, Accrual Adjustment Cash payments Accrual for Unused Facilities, Cash Payments Accrual for Unused Facilities, Cash Payments Accrual for excess facilities - ending balance Deferred rent Deferred Rent Credit Debt Disclosure [Abstract] Debt Debt Disclosure [Text Block] Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Stock Option Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Stock Options Roll Forward Schedule of Stock Options Roll Forward [Table Text Block] Grants and Exercises Under the Company's Option Plans Share-based Compensation Arrangement By Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value and Exercises in Period, Total Intrinsic Value [Table Text Block] Share-based Compensation Arrangement By Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value and Exercises in Period, 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[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] 7% Senior Notes due 2019 Seven Percent Senior Notes Due 2019 [Member] Seven Percent Senior Notes Due 2019 [Member] 10% Senior Notes due June 2017 Ten Percent Senior Notes Due June 2017 [Member] Senior Notes Due June 2017 [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Principal Debt Instrument, Face Amount Proceeds from the issuance of long-term debt, net of issuance costs Proceeds from Issuance of Long-term Debt Original issue discount Debt Instrument, Unamortized Discount Debt issuance costs Debt Issuance Costs, Gross Credit agreement borrowings Proceeds from Lines of Credit Reacquisition price Debt Instrument, Repurchase Amount Early termination fee Debt Instrument, Early Termination Fee Debt Instrument, Early Termination Fee Write off of unamortized issue costs Write off of Deferred Debt Issuance Cost Unamortized premium Debt Instrument, Unamortized Premium Interest accrued in escrow Debt Instrument, Escrow Interest Accrued Debt Instrument, Escrow Interest Gain (loss) on extinguishment of debt Gain (Loss) on Extinguishment of Debt Fixed charge coverage ratio Debt Instrument Fixed Charge Coverage Ratio Line Of Credit Facility Fixed Coverage Ratio Outstanding borrowings Long-term Line of Credit Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Legal fees Legal Fees Debt repurchased and extinguished Extinguishment of Debt, Amount Gain (loss) on extinguishment of debt before amortization of issuance cost and discount Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Restatement [Axis] Restatement [Axis] Restatement [Domain] Restatement [Domain] Balance at January 1, 2018 Previously Reported [Member] ASC 606 Adjustment Restatement Adjustment [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Assets Assets [Abstract] Accounts receivable, net Accounts Receivable, Net, Current Unbilled receivables, net Contract with Customer, Asset, Net, Current Inventoried costs Inventory, Net of Allowances, Customer Advances and Progress Billings Liabilities Liabilities [Abstract] Accrued expenses Accrued Liabilities, Current Billings in excess of costs and earnings on uncompleted contracts Contract with Customer, Liability, Current Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Accumulated deficit Retained Earnings (Accumulated Deficit) Organization and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] 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 Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) 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restructuring charges Restructuring 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 Increase (Decrease) in Prepaid Expense Other assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses Increase (Decrease) in Other Accrued Liabilities Accrued compensation Increase (Decrease) in Employee Related Liabilities Accrued interest Increase (Decrease) in Interest Payable, Net Billings in excess of costs and earnings on uncompleted contracts Increase (Decrease) in Contract with Customer, Liability Income tax receivable and payable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by (used in) operating activities from continuing operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Cash paid for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Proceeds from sale of assets Proceeds from Sale of Other Assets, Investing Activities Capital expenditures Payments for (Proceeds from) Productive Assets Net cash provided by (used in) investing activities from continuing operations Net Cash Provided by (Used in) Investing Activities, Continuing Operations Financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Proceeds from the issuance of long-term debt Extinguishment of long-term debt Repayments of Long-term Debt Proceeds (expenses) from the issuance of common stock Proceeds from Issuance of Common Stock Repayments under credit facility Repayments of Long-term Lines of Credit Debt issuance costs Payments of Debt Issuance Costs Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Other Proceeds from (Payments for) Other Financing Activities Net cash provided by financing activities from continuing operations Net Cash Provided by (Used in) Financing Activities, 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 Net investing cash flows of discontinued operations Cash Provided by (Used in) Investing Activities, Discontinued Operations Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, cash equivalents and restricted cash at beginning of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of year Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid during the year for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Net cash paid during the year for income taxes Income Taxes Paid, Net Noncash Investing and Financing Items [Abstract] Noncash Investing and Financing Items [Abstract] Capital expenditures included in accounts payable and accrued expenses Capital Expenditures Incurred but Not yet Paid Liability for contingent consideration and goodwill related to acquisition Business Combination, Contingent Consideration, Liability Income Statement [Abstract] Research and development expenses Research and Development Expense Impairment of goodwill Restructuring expenses and other Impairment Charges And Adjustments To Unused Office Space Liability Impairment Charges And Adjustments To Unused Office Space Liability Operating income (loss) from continuing operations Other income (expense): Other Nonoperating Income (Expense) [Abstract] Interest expense, net Interest Income (Expense), Nonoperating, Net Other income (loss), net Other Nonoperating Income (Expense) Total other expense, net Nonoperating Income (Expense) Income (loss) from continuing operations before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Provision (benefit) for income taxes from continuing operations Income Tax Expense (Benefit) Income (loss) from continuing operations Income (loss) from operations of discontinued component (including gain on disposal of $0.0 million for the year ended December 30, 2018) Basic income and loss per common share: Earnings Per Share, Basic [Abstract] Income (loss) from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Income (loss) from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Net income (loss) per common share (in dollars per share) Earnings Per Share, Basic Diluted income and loss per common share: Earnings Per Share, Diluted [Abstract] Income (loss) from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Income (loss) from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Net income (loss) per common share (in dollars per share) Earnings Per Share, Diluted Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Comprehensive Loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in cumulative translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Postretirement benefit reserve adjustment net of tax expense Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Principles of Consolidation and Basis of Presentation Consolidation, Policy [Policy Text Block] Fiscal Year Fiscal Period, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Inventoried Costs Inventory, Policy [Policy Text Block] Research and Development Research and Development Expense, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Income Taxes - Uncertain Tax Positions Income Tax Uncertainties, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Allowance for Doubtful Accounts Trade and Other Accounts Receivable, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Property and Equipment, Net Property, Plant and Equipment, Policy [Policy Text Block] Impairment or Disposal of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Leases Lessee, Leases [Policy Text Block] Goodwill and Other Intangible Assets, Net Goodwill and Intangible Assets, Policy [Policy Text Block] Impairment of Long-Lived Assets and Long-Lived Assets to Be Disposed Of Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Concentrations and Uncertainties Concentration Risk, Credit Risk, Policy [Policy Text Block] Debt Issuance Costs Debt, Policy [Policy Text Block] Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Fair Value Measurement Fair Value Measurement, Policy [Policy 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) Income Tax Disclosure [Abstract] Components of income (loss) from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest [Abstract] Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Provision (benefit) for income taxes from continuing operations Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract] Federal income taxes: Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Federal Tax Expense (Benefit) Deferred Deferred Federal Income Tax Expense (Benefit) Total Federal Federal Income Tax Expense (Benefit), Continuing Operations State and local income taxes State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current State and Local Tax Expense (Benefit) Deferred Deferred State and Local Income Tax Expense (Benefit) Total State and local State and Local Income Tax Expense (Benefit), Continuing Operations Foreign income taxes: Foreign Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Foreign Tax Expense (Benefit) Deferred Deferred Foreign Income Tax Expense (Benefit) Total Foreign Foreign Income Tax Expense (Benefit), Continuing Operations Total 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 Gain on disposal Unrecognized Tax Benefits Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at the beginning of period Unrecognized Tax Benefits Increases related to prior periods Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Increases related to current year tax positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Expiration of applicable statutes of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Decrease in federal tax rate Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Decreases related to disposition Unrecognized Tax Benefits, Decrease Resulting from Disposition Unrecognized Tax Benefits, Decrease Resulting from Disposition Balance at the end of period Significant Accounting Policies Disclosure [Table] Significant Accounting Policies Disclosure [Table] Significant Accounting Policies Disclosure [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Stock options Employee Stock Option [Member] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Income Statement Location [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Income Statement Location [Domain] Continuing operations Continuing Operations [Member] Selling, general and administrative expenses Selling, General and Administrative Expenses [Member] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Allowance for Doubtful Accounts SEC Schedule, 12-09, Allowance, Credit Loss [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Building facility Building [Member] Buildings and improvements Building and Building Improvements [Member] Machinery and equipment Other Machinery and Equipment [Member] Computer equipment and software Computer Equipment [Member] Vehicles, furniture, and office equipment Vehicles, Furniture, and Office Equipment [Member] Vehicles, Furniture, and Office Equipment [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] ASC 840 Accounting Standards Update 2016-02 [Member] Significant Accounting Policies Disclosure [Line Items] Significant Accounting Policies Disclosure [Line Items] [Line Items] for Significant Accounting Policies Disclosure [Table] Number of reportable segments Number of Reportable Segments Share-based Compensation Share-based Compensation, Allocation and Classification in Financial Statements [Abstract] Share-based incentive award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Employee Stock Purchase Plan offering & expense recognition period Employee Stock Purchase Plan, Offering Period Employee Stock Purchase Plan, Offering Period Stock-based compensation expense, amount recognized in the consolidated financial statements Allocated Share-based Compensation Expense Impact on net loss per common share, basic and diluted (in dollars per share) Allocated Share Based Compensation Expense, Net Of Tax, Earnings Per Share Basic and Diluted Allocated Share Based Compensation Expense, Net Of Tax, Earnings Per Share Basic and Diluted Allowance for Doubtful Accounts Allowance for Doubtful Accounts Receivable [Roll Forward] Balance at Beginning of Year Allowance for Doubtful Accounts Receivable Provisions Write-offs/Recoveries Allowance for Doubtful Accounts Receivable, Charge-offs and Recoveries, Net Allowance for Doubtful Accounts Receivable, Charge-offs and Recoveries, Net Balance at End of Year Cash and Cash Equivalents Cash and Cash Equivalents [Abstract] Restricted cash Restricted Cash and Cash Equivalents, Current Property and Equipment, Net Property, Plant and Equipment [Abstract] Useful life of property and equipment Property, Plant and Equipment, Useful Life Carrying value of building held-for-sale Assets Held-for-sale, Not Part of Disposal Group Remeasured fair value of building held-for-sale Property, Plant, and Equipment, Fair Value Disclosure Impairment loss on building reclassified from held-for-sale to held Impairment Charge on Reclassified Assets Goodwill and Other Intangible Assets, Net Intangible Assets, Net (Including Goodwill) [Abstract] Useful life of finite-lived intangible assets Finite-Lived Intangible Asset, Useful Life Interest Expense, Net Interest Income (Expense), Net [Abstract] Interest expense incurred primarily on the Company’s Senior Secured Notes Interest Expense, Debt Miscellaneous interest income Interest Income, Other Interest expense, net Interest Expense (Income), Net Interest expense on debt and miscellaneous interest income Foreign Currency Foreign Currency [Abstract] Foreign currency transaction gain (loss) Foreign Currency Transaction Gain (Loss), before Tax Recent Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Operating lease asset Operating Lease, Right-of-Use Asset Operating lease liability Operating Lease, Liability Net Loss Per Common Share Earnings Per Share [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2019 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Three Total Finite-Lived Intangible Assets, Net Significant Customers Significant Customers Disclosure [Text Block] Significant Customers Disclosure [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Risk-free interest rate, lower range (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk-free interest rate, upper range (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Volatility, lower range (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Volatility, upper range (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Forfeiture rate (percent) Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Rate Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Rate Dividend yield (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Carrying Amount Long-term Debt Fair Value Long-term Debt, Fair Value Debt issuance costs Debt Issuance Costs, Net Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Legal Entity of Counterparty, Type [Axis] Legal Entity of Counterparty, Type [Axis] Legal Entity Type of Counterparty [Domain] Legal Entity Type of 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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 Segment Information Segment Reporting Disclosure [Text Block] Current assets: Assets, Current [Abstract] Prepaid expenses Prepaid Expense, Current Other current assets Other Assets, Current Current assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets, Current Total current assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets, Noncurrent Non-current assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets, Noncurrent Total assets Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued compensation Employee-related Liabilities, Current Accrued interest Interest Payable, Current Other current liabilities Other Liabilities, Current Current liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Current Total current liabilities Liabilities, Current Long-term debt principal, net of current portion Long-term Debt, Excluding Current Maturities Other long-term liabilities Other Liabilities, Noncurrent Long-term liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Preferred stock, $0.001 par value, 5,000,000 authorized, 0 shares outstanding at December 30, 2018 and December 31, 2017 Preferred Stock, Value, Issued Common stock, $0.001 par value, 195,000,000 shares authorized; 103,766,899 and 103,297,525 shares issued and outstanding at December 30, 2018 and December 31, 2017, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Income Taxes Income Tax Disclosure [Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Letter of Credit Letter of Credit [Member] Swing Line Loan Swing Line Loan [Member] Swing Line Loan [Member] Revolving Loans plus outstanding Swingline Loans plus Letters of Credit Revolving Loan, Swingline Loan, and Line of Credit [Member] Revolving Loan, Swingline Loan, and Line of Credit [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] 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Credit Facility, Covenant Terms, Percentage of Reinvestment Reserve over Outstanding Borrowings in Excess of Capacity of Outstanding Borrowing Line of Credit Facility, Covenant Terms, Percentage of Reinvestment Reserve over Outstanding Borrowings in Excess of Capacity of Outstanding Borrowing Letter of credit exposure outstanding Debt Instrument, Covenant Compliance, Credit Line Outstanding Excluded From Calculation of Minimum Fixed Charge Coverage Ratio, Amount Debt Instrument, Covenant Compliance, Credit Line Outstanding Excluded From Calculation of Minimum Fixed Charge Coverage Ratio, Amount Basis spread on variable rate (percent) Debt Instrument, Basis Spread on Variable Rate Percentage of Borrowing Base or Total Commitment Amount, less than Line of Credit Facility, Covenant Terms, Minimum Percentage of Borrowing Base or Total Commitment Amount Line of Credit Facility, Covenant Terms, Minimum Percentage of Borrowing Base or Total Commitment Amount Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2014 Plan Two Thousand Fourteen Plan [Member] Two Thousand Fourteen Plan [Member] Stock Options and Restricted Stock Units Stock Options and Restricted Stock Units [Member] Stock Options and Restricted Stock Units [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Stock awards granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Number of shares available for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Total number of awards outstanding (shares) Share-Based Compensation Arrangement By Share Based Payment Award, Options And Other Than Options, Outstanding Number Share-Based Compensation Arrangement By Share Based Payment Award, Options And Other Than Options, Outstanding Number Award term or expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Total unrecognized stock-based compensation expense related to nonvested options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Total unrecognized stock-based compensation expense related to nonvested restricted stock units Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Unrecognized stock-based compensation expense, period for recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Fair value of vested awards Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Components of Deferred Tax Assets and Liabilities [Abstract] Components of Deferred Tax Assets and Liabilities [Abstract] Deferred tax assets: Components of Deferred Tax Assets [Abstract] Allowance for doubtful accounts Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Sundry accruals Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Vacation accrual Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Compensated Absences Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Payroll related accruals Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Lease accruals Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent Investments Deferred Tax Assets, Investments Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Capital loss carryforwards Deferred Tax Assets, Capital Loss Carryforwards Tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards Deferred revenue Deferred Tax Assets, Deferred Income Reserves and other Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves and Other Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves and Other Gross deferred tax assets Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Total deferred tax assets, net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Unearned revenue Deferred Tax Liabilities, Unearned Revenue Deferred Tax Liabilities, Unearned Revenue Other intangibles Deferred Tax Liabilities, Intangible Assets Property and equipment, principally due to differences in depreciation Deferred Tax Liabilities, Property, Plant and Equipment Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax liability Deferred Tax Liabilities, Net Quarterly Financial Information Disclosure [Abstract] Summarized Quarterly Financial Information Quarterly Financial Information [Table Text Block] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Federal Domestic Tax Authority [Member] State State and Local Jurisdiction [Member] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Reduction to deferred tax asset Tax Cuts And Jobs Act, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense Tax Cuts And Jobs Act, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense Transition tax Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense Increase in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Operating loss carryforwards Operating Loss Carryforwards 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 deferred income taxes or foreign withholding taxes Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries Unrecognized deferred income taxes or foreign withholding taxes, cash and cash equivalents available for distribution Deferred Tax Liability Not Recognized, Undistributed Earnings of Foreign Subsidiaries, Cash and Cash Equivalents Available for Distribution Deferred Tax Liability Not Recognized, Undistributed Earnings of Foreign Subsidiaries, Cash and Cash Equivalents Available for Distribution Unrecognized tax benefits that if recognized would affect effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Amount that would become a deferred tax asset included in unrecognized tax benefits that would impact the effective tax rate Unrecognized Tax Benefits That Would Impact Effective Tax Rate, Deferred Tax Assets Unrecognized Tax Benefits That Would Impact Effective Tax Rate, Deferred Tax Assets Income tax penalties and interest expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Benefit for income tax penalties and interest related to reversal of prior positions Unrecognized Tax Benefits, Income Tax Penalties and Interest Benefit, Reversals of Prior Positions Unrecognized Tax Benefits, Income Tax Penalties and Interest Benefit, Reversals of Prior Positions Total interest and penalties accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Unrecognized tax benefits that will expire within the next 12 months Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Gross profit Income (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Income (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income (loss) Basic income (loss) per common share: Diluted income (loss) per common share: Public Safety & Security Public Safety and Security [Member] Public Safety and Security [Member] Disposal Group, Held-for-sale Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Income Statement Location [Axis] Income Statement Location [Domain] 6.5% Notes Six Point Five Percent Senior Secured Notes Due 2025 [Member] Six Point Five Percent Senior Secured Notes Due 2025 [Member] Purchase price, in cash Disposal Group, Including Discontinued Operation, Consideration Working capital adjustments Disposal Group, Including Discontinued Operation, Working Capital Adjustment Disposal Group, Including Discontinued Operation, Working Capital Adjustment Proceeds from divestiture Proceeds from Divestiture of Businesses 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 Cost adjustments Disposal Group, Including Discontinued Operation, Impact On Revenue Of Project Cost Adjustments Disposal Group, Including Discontinued Operation, Impact On Revenue Of Project Cost Adjustments Transaction-related costs Disposal Group, Including Discontinued Operation, Transaction Related Cost Disposal Group, Including Discontinued Operation, Transaction Related Cost Depreciation and amortization expense Disposal Group, Including Discontinued Operation, Depreciation and Amortization Income tax expense (benefit) reclassification Discontinued Operation, Reclassification Of Tax Effect of Discontinued Operation Discontinued Operation, Reclassification Of Tax Effect of Discontinued Operation Balance Sheet Details Supplemental Balance Sheet Disclosures [Text Block] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Non-US Non-US [Member] Percentage of foreign revenue to total revenue (as a percent) Entity Wide Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries, Percentage Entity Wide Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries, Percentage Loss accrual Loss Contingency Accrual, Provision Impairment of goodwill Goodwill, Impairment Loss Business exit costs Business Exit Costs Assets of foreign subsidiaries Entity Wide Disclosure on Geographic Areas, Assets in Foreign Countries Entity Wide Disclosure on Geographic Areas, Assets in Foreign Countries Effect of Fourth Quarter Events [Table] Effect of Fourth Quarter Events [Table] Effect of Fourth Quarter Events [Line Items] Effect of Fourth Quarter Events [Line Items] Income tax (benefit) at federal statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State taxes, net of federal tax benefit and valuation allowance Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Difference in tax rates between U.S. and foreign Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Increase (decrease) in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Nondeductible expense Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Increase in reserve for uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Changes to indefinite life items and separate state deferred taxes Income Tax Reconciliation, Changes to Indefinite Life Items and Separate State Deferred Taxes Income Tax Reconciliation, Changes to Indefinite Life Items and Separate State Deferred Taxes One-time transition tax on previously undistributed foreign earnings Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Amount Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Amount Goodwill impairment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount Decrease in deferred taxes related to disposition Effective Income Tax Rate Reconciliation, Disposition of Asset, Amount Impact related to the 2017 Tax Act Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount 10-year term loan Loans Payable [Member] Maturity period (in years) Debt Instrument, Maturity Period Debt Instrument, Maturity Period Number of subsidiary owned Number of Subsidiary Owned Number of Subsidiary Owned Number of Shares Under Option Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options outstanding at beginning of period, Number of Options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted, Number of Options (in shares) Exercised, Number of Options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited or expired, Number of Options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Options outstanding at end of period, Number of Options (in shares) Options exercisable, Number of Options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted-Average Exercise Price per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Options outstanding at beginning of period, Weighted-Average Exercise Price per Share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted, Weighted-Average Exercise Price per Share (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised, Weighted-Average Exercise Price per Share (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited or expired, Weighted-Average Exercise Price per Share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Options outstanding at end of period, Weighted-Average Exercise Price per Share (in dollars per share) Options exercisable, Weighted-Average Exercise Price per Share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted- Average Remaining Contractual Term and Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Options outstanding, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options exercisable, Weighted-Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Options outstanding, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options exercisable, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Shares from stock options and awards Stock Options and Stock Awards [Member] Stock Options and Stock Awards [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of EPS (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Future Minimum Lease Payments, Capital and Operating Leases Schedule of Future Minimum Lease Payments, Capital and Operating Leases [Table Text Block] Schedule of Future Minimum Lease Payments, Capital and Operating Leases [Table Text Block] Schedule of Unused Facilities Accrual Roll-forward Schedule of Unused Facilities Accrual Roll Forward [Table Text Block] Schedule of Unused Facilities Accrual Roll Forward [Table Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule of Acquired Finite-Lived Intangible Assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of Future Amortization Expense of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Fair value of long-term debt Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] 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] 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 Cost of revenue Cost of Revenue Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Provision for loss on contracts Provision for Loss on Contracts Revenue recognized Contract with Customer, Liability, Revenue Recognized Accounts receivable Accounts Receivable, Gross Schedule of Accounts, Notes, Loans and Financing Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Inventory, Current Schedule of Inventory, Current [Table Text Block] Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Schedule of Income before Income Tax, Domestic and Foreign Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Income Tax Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Unrecognized Tax Benefits Roll Forward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures Disposal Groups, Including Discontinued Operations [Table Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] US. Government Cost Claims US. Government Cost Claims [Member] US. Government Cost Claims [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Settlement on matters related to unallowable costs Litigation Settlement, Amount Awarded to Other Party Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Fixed price Fixed-price Contract [Member] Cost plus fee Cost Plus Fee Contract [Member] Cost Plus Fee Contract [Member] Time and materials Time-and-materials Contract [Member] U.S. Government United States Government [Member] United States Government [Member] International Non-US Government [Member] Non-US Government [Member] U.S. Commercial and other customers United States Commercial And Other Customers [Member] United States Commercial And Other Customers [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Goodwill and Other Intangible Assets Goodwill and Intangible Assets 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] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer relationships Customer Relationships [Member] Contracts and backlog Contracts and Backlog [Member] Contracts and Backlog [Member] Developed technology and technical know-how Developed Technology Rights [Member] Trade names Trade Names [Member] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Acquired finite-lived intangible assets: Finite-Lived Intangible Assets, Net [Abstract] Gross Value Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Indefinite-lived trade names Indefinite-lived Intangible Assets (Excluding Goodwill) Total intangible assets, Gross Value Intangible Assets, Gross (Excluding Goodwill) Total intangible assets, Net Value Aggregate amortization expense for finite-live intangible assets Amortization of Intangible Assets Schedule of Goodwill [Table] Schedule of Goodwill [Table] Kratos Unmanned Systems (US) Goodwill [Line Items] Goodwill [Line Items] Number of operating segments Number of Operating Segments Number of lost contract opportunities Number Of Lost Contract Opportunities Number Of Lost Contract Opportunities Lost contract opportunities period Lost Contract Opportunities Period Lost Contract Opportunities Period Carrying amounts of goodwill by reportable segment Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Gross value Goodwill, Gross Less accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Net Subsequent Events Subsequent Events [Text Block] Lease Commitments Leases of Lessee Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurement Fair Value Disclosures [Text Block] Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Line Items] Class of Stock [Line Items] Common stock sold (in shares) Purchase price of common stock sold (dollars per share) Sale of Stock, Price Per Share Gross proceeds from sell of stock Sale of Stock, Consideration Received on Transaction Gross Proceeds From Issuance Of Common Stock Gross Net proceeds used to pay-off debt Repayments of Secured Debt Approximate amount of debt paid-off Restricted Stock Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested balance at beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Grants (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeitures (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Vested but not released (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested But Not Released Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested But Not Released Nonvested balance at end of period (in shares) Weighted-Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Nonvested balance at beginning of period, Weighted-Average Grant Date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Grants, Weighted-Average Grant Date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested, Weighted-Average Grant Date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeitures, Weighted-Average Grant Date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Vested but not released, Weighted-Average Grant Date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period But Not Released, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period But Not Released, Weighted Average Grant Date Fair Value Nonvested balance at end of period, Weighted-Average Grant Date Fair Value (in dollars per share) Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Number of shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Minimum weekly employment threshold to qualify for ESPP Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award, Minimum Weekly Employment Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award, Minimum Weekly Employment Minimum annual employment threshold to qualify for ESPP Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award, Minimum Annual Employment Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award, Minimum Annual Employment Maximum percentage of employee compensation eligible to purchase shares under ESPP (percent) Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Purchase price of common stock as a percent of fair market value (percent) Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Cumulative number of shares issued under ESPP (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number Number of shares available for future issuance (in shares) Number of shares issued under the plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Average share price of shares issued under the plan (dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased Assumptions and resulting fair values of options granted Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Expected term (in years) Expected volatility, lower range (percent) Expected volatility, upper range (percent) Expected dividend yield (percent) Weighted average grant-date fair value per share (in dollars per share) Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Land and buildings Land and Building [Member] Furniture and office equipment Office Equipment [Member] Leasehold improvements Leasehold Improvements [Member] Construction in progress Construction in Progress [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment Property, Plant and Equipment, Gross Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total property and equipment, net Depreciation expense Depreciation and Amortization of Leased Assets Depreciation and Amortization of Leased Assets Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Accounts receivable, net Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Inventoried costs Disposal Group, Including Discontinued Operation, Inventory, Current Other current assets Disposal Group, Including Discontinued Operation, Other Assets, Current Current assets of discontinued operations Property, plant and equipment, net Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent Goodwill Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent Other assets Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent Non-current assets of discontinued operations Accounts payable Disposal Group, Including Discontinued Operation, Accounts Payable, Current Accrued expenses Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current Accrued compensation Disposal Group, Including Discontinued Operation, Employee-related Liabilities, Current Disposal Group, Including Discontinued Operation, Employee-related Liabilities, Current Billings in excess of cost and earnings on uncompleted contracts Disposal Group, Including Discontinued Operation, Billings in Excess of Cost Disposal Group, Including Discontinued Operation, Billings in Excess of Cost Other current liabilities Disposal Group, Including Discontinued Operation, Other Liabilities, Current Current liabilities of discontinued operations Other long-term liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent