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Organization and Summary of Significant Accounting Policies (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) Segment | Dec. 31, 2017 USD ($) Segment type_of_contract $ / shares | Dec. 25, 2016 USD ($) $ / shares | Dec. 27, 2015 USD ($) $ / shares | Sep. 25, 2016 USD ($)
Significant Accounting Policies Disclosure [Line Items] |  |  |  |  |  |
Number of reportable segments | Segment |  | 3 | 3 |  |  |
Fiscal year duration |  |  | 371 days | 364 days | 364 days |
Number of different types of contractual arrangements | type_of_contract |  |  | 3 |  |  |
Number of basic categories of fixed price contracts | type_of_contract |  |  | 3 |  |  |
Accruals for losses on contracts | $ 10,300,000 |  | $ 10,300,000 | $ 17,700,000 |  |
Share-based Compensation |  |  |  |  |  |
Employee Stock Purchase Plan offering & expense recognition period |  |  | 6 months |  |  |
Incremental tax benefits from exercise of stock options |  |  | $ 0 | $ 0 | $ 0 |
Impact on net loss per common share, basic and diluted (in dollars per share) | $ / shares |  |  | $ (0.09) | $ (0.08) | $ (0.10) |
Allowance for Doubtful Accounts |  |  |  |  |  |
Provisions |  |  | $ 100,000 | $ 300,000 | $ 400,000 |
Cash and Cash Equivalents |  |  |  |  |  |
Restricted cash | 400,000 |  | 400,000 | 500,000 |  |
Interest Expense, Net |  |  |  |  |  |
Interest expense incurred primarily on the Company’s Senior Secured Notes |  |  | (29,100,000) | (34,700,000) | (36,000,000) |
Miscellaneous interest income |  |  | 500,000 | 0 | 0 |
Interest expense, net |  |  | (28,600,000) | (34,700,000) | (36,000,000) |
Foreign Currency |  |  |  |  |  |
Foreign currency transaction gain (loss) |  |  | $ 400,000 | 400,000 | (800,000) |
Minimum |  |  |  |  |  |
Significant Accounting Policies Disclosure [Line Items] |  |  |  |  |  |
Fiscal year duration |  |  | 364 days |  |  |
Share-based Compensation |  |  |  |  |  |
Share-based incentive award vesting period |  |  | 5 years |  |  |
Goodwill and Other Intangible Assets, Net |  |  |  |  |  |
Useful life of finite-lived intangible assets |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |
Significant Accounting Policies Disclosure [Line Items] |  |  |  |  |  |
Fiscal year duration |  |  | 371 days |  |  |
Share-based Compensation |  |  |  |  |  |
Share-based incentive award vesting period |  |  | 10 years |  |  |
Goodwill and Other Intangible Assets, Net |  |  |  |  |  |
Useful life of finite-lived intangible assets |  |  | 15 years |  |  |
Buildings and improvements | Minimum |  |  |  |  |  |
Property and Equipment, Net |  |  |  |  |  |
Useful life of property and equipment |  |  | 15 years |  |  |
Buildings and improvements | Maximum |  |  |  |  |  |
Property and Equipment, Net |  |  |  |  |  |
Useful life of property and equipment |  |  | 39 years |  |  |
Machinery and equipment | Minimum |  |  |  |  |  |
Property and Equipment, Net |  |  |  |  |  |
Useful life of property and equipment |  |  | 3 years |  |  |
Machinery and equipment | Maximum |  |  |  |  |  |
Property and Equipment, Net |  |  |  |  |  |
Useful life of property and equipment |  |  | 10 years |  |  |
Computer equipment and software | Minimum |  |  |  |  |  |
Property and Equipment, Net |  |  |  |  |  |
Useful life of property and equipment |  |  | 1 year |  |  |
Computer equipment and software | Maximum |  |  |  |  |  |
Property and Equipment, Net |  |  |  |  |  |
Useful life of property and equipment |  |  | 10 years |  |  |
Vehicles, furniture, and office equipment | Maximum |  |  |  |  |  |
Property and Equipment, Net |  |  |  |  |  |
Useful life of property and equipment |  |  | 5 years |  |  |
Allowance for Doubtful Accounts |  |  |  |  |  |
Allowance for Doubtful Accounts |  |  |  |  |  |
Balance at Beginning of Year |  | $ 1,700,000 | $ 1,700,000 | 1,800,000 | 1,900,000 |
Provisions |  |  | 100,000 | 300,000 | 400,000 |
Write-offs/Recoveries |  |  | (1,200,000) | (400,000) | (500,000) |
Balance at End of Year | 600,000 |  | 600,000 | 1,700,000 | 1,800,000 |
Continuing operations |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |
Stock-based compensation expense, amount recognized in the consolidated financial statements |  |  | 7,800,000 | 5,100,000 | 6,100,000 |
Selling, general and administrative expenses |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |
Stock-based compensation expense, amount recognized in the consolidated financial statements |  |  | 7,800,000 | 5,100,000 | $ 6,100,000 |
Revenue | Accounting Standards Update 2014-09 |  |  |  |  |  |
Recent Accounting Pronouncements |  |  |  |  |  |
Cumulative effect of adopting ASU 2014-09, less than | 2,000,000 |  | 2,000,000 |  |  |
Operating Income | Accounting Standards Update 2014-09 |  |  |  |  |  |
Recent Accounting Pronouncements |  |  |  |  |  |
Cumulative effect of adopting ASU 2014-09, less than | 2,000,000 |  | 2,000,000 |  |  |
Kratos Government Solutions (KGS) |  |  |  |  |  |
Recent Accounting Pronouncements |  |  |  |  |  |
Impairment of goodwill | 24,200,000 |  | $ 24,200,000 |  |  |
Kratos Government Solutions (KGS) | Building facility |  |  |  |  |  |
Property and Equipment, Net |  |  |  |  |  |
Carrying value of building held-for-sale |  |  |  |  |  | $ 1,900,000
Remeasured fair value of building held-for-sale |  |  |  | 500,000 |  |
Impairment loss on building reclassified from held-for-sale to held |  |  |  | 1,400,000 |  |
Stock options | Maximum |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |
Share-based incentive award vesting period |  |  | 6 years |  |  |
Purchase order not received |  |  |  |  |  |
Significant Accounting Policies Disclosure [Line Items] |  |  |  |  |  |
Accounts receivable | $ 1,900,000 |  | $ 1,900,000 | $ 2,000,000 |  |

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