Debt Disclosure [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Letter of Credit Letter of Credit [Member] Swing Line Loan Swing Line Loan [Member] Swing Line Loan [Member] 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] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 2014 Credit Agreement, Third Amendment Two Thousand Fourteen Credit Agreement, Third Amendment [Member] Two Thousand Fourteen Credit Agreement, Third Amendment [Member] 7% Senior Notes due 2019 Seven Percent Senior Notes Due 2019 [Member] Seven Percent Senior Notes Due 2019 [Member] 2014 Credit Agreement, Fourth Amendment Two Thousand Fourteen Credit Agreement, Fourth Amendment [Member] Two Thousand Fourteen Credit Agreement, Fourth Amendment [Member] Amendment Credit Agreement Amendment Credit Agreement [Member] Amendment Credit Agreement [Member] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Fixed charge coverage ratio not measured Scenario One [Member] Scenario One [Member] Fixed charge coverage ratio of at least 1.05 Scenario Two [Member] Scenario Two [Member] Herley disposition proceeds reinvestment reserve, as defined in the amendment Scenario Five [Member] Scenario Five [Member] Fixed charge coverage ratio of at least 1.10 Scenario Three [Member] Scenario Three [Member] Fixed charge coverage ratio remains at 1.15 Scenario Four [Member] Scenario Four [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior notes Senior Notes [Member] 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] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Federal Funds Rate Federal Funds Effective Swap Rate [Member] LIBOR rate London Interbank Offered Rate (LIBOR) [Member] Base Rate Base Rate [Member] Eurodollar Rate Eurodollar [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Maturity period Debt Instrument, Maturity Period Debt Instrument, Maturity Period Potential maximum borrowing capacity, subject to Lender approval Line Of Credit Facility, Maximum Possible Borrowings Subject To Application And Bank Approval Line Of Credit Facility, Maximum Possible Borrowings Subject To Application And Bank Approval Fixed charge coverage ratio Debt Instrument Fixed Charge Coverage Ratio Line Of Credit Facility Fixed Coverage Ratio Minimum amount required to repurchase Line of Credit Facility, Covenant Compliance, Required Amount of Loan Repurchased Line of Credit Facility, Covenant Compliance, Required Amount of Loan Repurchased Covenant terms, capacity of outstanding loans of credit Line of Credit Facility, Covenant Terms, Capacity of Outstanding Borrowing Line of Credit Facility, Covenant Terms, Capacity of Outstanding Borrowing Covenant terms, percentage of reinvestment in excess of loans and credit (percent) Line of 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 Stated interest rate Debt Instrument, Interest Rate, Stated Percentage 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 Debt term Debt Instrument, Term Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Percentage of borrowing base, 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 Outstanding borrowings Long-term Line of Credit Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Discontinued Operations and Disposal Groups [Abstract] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Accounts receivable, net and unbilled receivables, 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 Disposal Group, Including Discontinued Operation, Assets, Current 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 Disposal Group, Including Discontinued Operation, Assets, Noncurrent 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 Disposal Group, Including Discontinued Operation, Liabilities, Current Non-current liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Equity [Abstract] Increase (Decrease) in Stockholders' Equity [Roll Forward] Shares outstanding at beginning of the period Common Stock, Shares, Outstanding Stock issued for cash Stock Issued During Period, Shares, New Issues Stock issued for employee stock purchase plan, stock options and restricted stock units exercised Stock Issued During Period, Shares, Employee Stock Purchase Plan, Stock Options And Restricted Stock Units Stock Issued During Period, Shares, Employee Stock Purchase Plan, Stock Options And Other Shares outstanding at end of the period Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of New Accounting Pronouncements Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Cumulative translation adjustment Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Post-retirement benefit reserve adjustment net of tax expense Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Reclassifications from other comprehensive income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Income Tax Disclosure [Abstract] Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] Effective Income Tax Rate Reconciliation, Amount [Abstract] Income tax benefit at federal statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State and foreign taxes, net of federal tax benefit and valuation allowance Income Tax Reconciliation State Income Taxes And Foreign Income Tax Rate Differential Current State And Foreign Tax Expense Benefit Nondeductible expenses and other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Impact of deferred tax liabilities for indefinite-lived assets Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Increase (decrease) in reserves for uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Increase in federal valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Total income tax provision Income Tax Expense (Benefit) Inventory Disclosure [Abstract] Inventoried Costs Inventory Disclosure [Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] 10% Senior Notes due June 2017 Ten Percent Senior Notes Due June 2017 [Member] Senior Notes Due June 2017 [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] 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 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] 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] 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] 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) Increase (Decrease) in Stockholders' Equity [Roll Forward] Stockholders’ equity at beginning of period Stockholders' Equity Attributable to Parent Impact from the adoption of ASC 606 (Note 1) Cumulative Effect of New Accounting Principle in Period of Adoption Comprehensive loss: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Net loss Net Income (Loss) Attributable to Parent Change in cumulative translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Exercise of stock options and warrants Stock Issued During Period, Value, Stock Options Exercised Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Issuance of common stock for cash Stock Issued During Period, Value, New Issues Issuance of common stock for employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Restricted stock units traded for taxes Adjustments Related to Tax Withholding for Share-based Compensation Stockholders’ equity at end of period Federal annual utilization of NOL carryforwards limit, next five years Operating Loss Carryforwards, Federal Annual Utilization Limit, Five Years Succeeding Initial Ownership Change Operating Loss Carryforwards, Federal Annual Utilization Limit, Five Years Succeeding Initial Ownership Change Threshold period for change in allowed annual amount of NOL to be recognized Threshold Period for Change in Allowed Annual Amount of Operating Loss Carryforward to be Recognized Threshold Period for Change in Allowed Annual Amount of Operating Loss Carryforward to be Recognized Federal annual utilization of NOL carryforwards limit, after year five Operating Loss Carryforwards, Federal Annual Utilization Limit, After Year Five Operating Loss Carryforwards, Federal Annual Utilization Limit, After Year Five Unrecognized tax benefits that if recognized would impact the effective tax rate for continuing operations Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized tax benefits increase current and prior year positions Unrecognized Tax Benefits, Increase Resulting from Current And Prior Period Tax Positions Unrecognized Tax Benefits, Increase Resulting from Current And Prior Period Tax Positions Discontinued operation, unrecognized tax benefits Discontinued Operation, Unrecognized Tax Benefits Discontinued Operation, Unrecognized Tax Benefits Unrecognized tax benefits, decrease from discontinued operations Unrecognized Tax Benefits, Decrease Resulting From Discontinued Operations Unrecognized Tax Benefits, Decrease Resulting From Discontinued Operations Expense for interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Decrease in interest and penalties Unrecognized Tax Benefits, Increase (Decrease) In Income Tax Penalties And Interest Expense Unrecognized Tax Benefits, Increase (Decrease) In Income Tax Penalties And Interest Expense Liabilities for uncertain tax positions that could expire within twelve months Decrease in Unrecognized Tax Benefits is Reasonably Possible 6.5% Notes Six Point Five Percent Senior Secured Notes Due 2025 [Member] Six Point Five Percent Senior Secured Notes Due 2025 [Member] 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 Debt outstanding Long-term Debt Public Safety & Security Public Safety and Security [Member] Public Safety and Security [Member] Disposal Group, Held-for-sale, Not Discontinued Operations Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Selling, General and Administrative Expenses Selling, General and Administrative Expenses [Member] Purchase price, in cash Disposal Group, Including Discontinued Operation, Consideration Proceeds from divestiture Proceeds from Divestiture of Businesses Working capital retained Divestiture of Businesses, Working Capital Retained Divestiture of Businesses, Working Capital Retained Transaction costs Disposal Group, Including Discontinued Operation, Transaction Costs Disposal Group, Including Discontinued Operation, Transaction Costs Impact of revenue Disposal Group, Including Discontinued Operation, Impact On Revenue Of Project Cost Adjustments Disposal Group, Including Discontinued Operation, Impact On Revenue Of Project Cost Adjustments Impact of operating results Disposal Group, Including Discontinued Operation, Impact On Operating Income (Loss) Of Project Cost Adjustments Disposal Group, Including Discontinued Operation, Impact On Operating Income (Loss) Of Project Cost Adjustments Transaction-related costs Disposal Group, Including Discontinued Operation, Transaction Related Cost Disposal Group, Including Discontinued Operation, Transaction Related Cost Depreciation and amortization Disposal Group, Including Discontinued Operation, Depreciation and Amortization Risks and Uncertainties [Abstract] Schedule of Revenue by Major Customers, by Reportiing Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Government contracts Government Contracts Concentration Risk [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue Sales Revenue, Net [Member] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] U.S. Government U.S. Government [Member] U.S. Government, major customer [Member] Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Sales to the U.S. Government, amount Revenues Sales to the U.S. Government, percentage of total revenue (percent) Concentration Risk, Percentage Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Debt Debt Disclosure [Text Block] Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net income (loss) Loss (income) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Loss from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile loss from continuing operations to net cash provided by (used in) operating activities from continuing operations: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Stock-based compensation Share-based Compensation Deferred income taxes Deferred Income Tax Expense (Benefit) Amortization of deferred financing costs Amortization of Deferred Charges Amortization of discount on Senior Secured Notes Amortization of Debt Discount (Premium) Loss on extinguishment of debt Provision for doubtful accounts Provision for Doubtful Accounts Changes in assets and liabilities, net of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Unbilled receivables Increase (Decrease) in Contract with Customer, Asset Inventoried costs Increase (Decrease) in Inventories Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses Increase (Decrease) in Other Accrued Liabilities Accrued compensation Increase (Decrease) in Employee Related Liabilities Advance payments received on contracts Increase (Decrease) In Contract With Customer, Liability, Advance Payments Increase (Decrease) In Contract With Customer, Liability, Advance Payments 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 Capital expenditures Payments to Acquire Productive Assets Proceeds from sale of assets Proceeds from Sale of Other Assets, Investing Activities 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] Extinguishment of long-term debt Repayments of Long-term Debt Debt issuance costs Payments of Debt Issuance Costs Proceeds from the issuance of common stock Proceeds from Issuance of Common Stock Repayment of debt Repayments of Long-term Lines of Credit Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan Proceeds from (Repurchase of) Equity Net cash provided by financing activities from continuing operations Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash flows of continuing operations Net Cash Provided by (Used in) Continuing Operations Net operating cash flows of discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations 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 period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of period Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Income Taxes Income Tax Disclosure [Text Block] Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Cost of revenue Cost of Revenue Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Contract assets, Net change Contract With Customer, Asset, Increase (Decrease) Contract With Customer, Asset, Increase (Decrease) Contract liabilities, Net change Contract With Customer, Liability, Increase (Decrease) Contract With Customer, Liability, Increase (Decrease) Revenue recognized Contract with Customer, Liability, Revenue Recognized Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Reportable Segments Operating Segments [Member] Unallocated corporate expense, net Corporate, Non-Segment [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] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Service Service [Member] Product Product [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenues: Revenues [Abstract] Total revenues Depreciation & amortization: Depreciation, Depletion and Amortization, Nonproduction [Abstract] Total depreciation and amortization Operating income from continuing operations: Operating Income (Loss) [Abstract] Operating income from continuing operations Operating Income (Loss) Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule of Intangible Assets (Finite-Lived) Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Intangible Assets (Indefinite-Lived) Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] Settled Litigation Settled Litigation [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Settlement amount related to unallowable costs Litigation Settlement, Amount Awarded to Other Party Litigation related charges Litigation Settlement, Expense Significant Customers Concentration Risk Disclosure [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Gross value Goodwill, Gross Less accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Net Goodwill Document And Entity Information -- None. No documentation exists for this element. -- Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Carrying Amounts and Estimated Fair Value of Long-Term Debt Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Revenue Disposal Group, Including Discontinued Operation, Revenue Cost of sales Disposal Group, Including Discontinued Operation, Costs of Goods Sold Selling, general and administrative expenses Disposal Group, Including Discontinued Operation, General and Administrative Expense Other (income) expense, net 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 Income (loss) from operations of discontinued components Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Income tax benefit (expense) Discontinued Operation, Tax Effect of Discontinued Operation Income (loss) from discontinued operations Summary of Changes in Stockholders' Equity Schedule of Stockholders Equity [Table Text Block] Components of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Rollforward of Common Stock Outstanding Schedule of Common Stock Outstanding Roll Forward [Table Text Block] Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Statement of Financial Position [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents, Current Prepaid expenses Prepaid Expense, Current Other current assets Other Assets, Current Current assets of discontinued operations Total current assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Goodwill Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets, Noncurrent Non-current assets of discontinued operations Total assets 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 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 Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at September 30, 2018 and December 31, 2017 Preferred Stock, Value, Issued Common stock, $0.001 par value, 195,000,000 shares authorized; 103,752,514 and 103,297,525 shares issued and outstanding at September 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 deficit Total stockholders’ equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and stockholders’ equity Liabilities and Equity Earnings Per Share [Abstract] Net Loss per Common Share Earnings Per Share [Text Block] Revenue Recognition Revenue from Contract with Customer [Text Block] 10-year term loan Loans Payable [Member] Debt instrument, face amount Number of subsidiaries acquired Number of Subsidiary Owned Number of Subsidiary Owned Contract assets Contract with Customer, Asset, Net Contract liabilities Contract with Customer, Liability Net contract assets Contract With Customer, Asset (Liability), Net Contract With Customer, Asset (Liability), Net Net contract assets, Net change Contract With Customer, Asset (Liability), Net Increase (Decrease) Contract With Customer, Asset (Liability), Net Increase (Decrease) Schedule of net contract assets (liabilities) Contract with Customer, Asset and Liability [Table Text Block] Schedule of disaggregation of revenue Disaggregation of Revenue [Table Text Block] Schedule of Discontinued Operations, Income Statement and Balance Sheet Disposal Groups, Including Discontinued Operations [Table 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 by Major Class [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Acquired finite-lived intangible assets: Finite-Lived Intangible Assets, Net [Abstract] Gross Value Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Value Finite-Lived Intangible Assets, Net Indefinite-lived trade names Indefinite-lived Intangible Assets (Excluding Goodwill) Total intangible assets: Gross Value Intangible Assets (Excluding Goodwill), Gross Intangible Assets (Excluding Goodwill), Gross Total intangible assets: Net Value Aggregate amortization expense for finite-lived intangible assets Amortization of Intangible Assets Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock options and awards Stock Options and Stock Awards [Member] Stock Options and Stock Awards [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of EPS (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Inventoried Costs Schedule of Inventory, Current [Table Text Block] Raw materials Inventory, Raw Materials, Net of Reserves Work in process Inventory, Work in Process, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves 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 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] 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 Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Table] 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 Schedule of Segment Revenues, Depreciation and Amortization, and Operating Income (Loss) Schedule of Segment Reporting Information, by Segment [Table Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Fiscal Year Fiscal Period, Policy [Policy Text Block] Accounting Estimates Use of Estimates, Policy [Policy Text Block] Accounting Standards Updates New Accounting Pronouncements, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Net Loss per Common Share Earnings Per Share, Policy [Policy Text Block] Carrying Amount Fair Value Long-term Debt, Fair Value Unamortized debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Preferred Stock: Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Shares authorized (in shares) Preferred Stock, Shares Authorized Shares outstanding (in shares) Preferred Stock, Shares Outstanding Common Stock: Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Par value (in dollars per share) Common Stock, Par or Stated Value Per Share Shares authorized (in shares) Common Stock, Shares Authorized Shares issued (in shares) Common Stock, Shares, Issued Shares outstanding (in shares) Number of reportable segments Number of Reportable Segments Pending legal settlement Legal costs Legal Fees Income Statement [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Research and development expenses Research and Development Expense Restructuring expenses and other Restructuring Charges And Other Expenses Restructuring Charges And Other Expenses Operating income from continuing operations Other income (expense): Other Nonoperating Income (Expense) [Abstract] Interest expense, net Interest Income (Expense), Nonoperating, Net Loss on extinguishment of debt Other income (expense), net Other Nonoperating Income (Expense) Total other expense, net Nonoperating Income (Expense) Income (loss) from continuing operations before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Provision (benefit) for income taxes from continuing operations Loss from continuing operations Discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Income tax benefit (expense) Basic income (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 continuing 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 (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: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Comprehensive Income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Change in cumulative translation adjustment