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Organization and Summary of Significant Accounting Policies - (Details) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 01, 2017 USD ($) Segment | Dec. 30, 2018 USD ($) Segment $ / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 25, 2016 USD ($) $ / shares | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($) | Sep. 25, 2016 USD ($)
Significant Accounting Policies Disclosure [Line Items] |  |  |  |  |  |  |
Number of reportable segments | Segment | 2 | 3 |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Employee Stock Purchase Plan offering & expense recognition period |  | 6 months |  |  |  |  |
Impact on net loss per common share, basic and diluted (in dollars per share) | $ / shares |  | $ (0.07) | $ (0.09) | $ (0.08) |  |  |
Allowance for Doubtful Accounts |  |  |  |  |  |  |
Provisions |  | $ 1,800 | $ 0 | $ 100 |  |  |
Cash and Cash Equivalents |  |  |  |  |  |  |
Restricted cash |  | 300 | 400 |  |  |  |
Interest Expense, Net |  |  |  |  |  |  |
Interest expense incurred primarily on the Company’s Senior Secured Notes |  | (21,600) | (29,100) | (34,700) |  |  |
Miscellaneous interest income |  | 800 | 500 | 0 |  |  |
Interest expense, net |  | (20,800) | (28,600) | (34,700) |  |  |
Foreign Currency |  |  |  |  |  |  |
Foreign currency transaction gain (loss) |  | (1,100) | 400 | 400 |  |  |
Recent Accounting Pronouncements |  |  |  |  |  |  |
Accumulated deficit |  | $ 724,500 | 720,800 |  |  |  |
ASC 606 |  |  |  |  |  |  |
Recent Accounting Pronouncements |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  | $ 721,000 |
ASC 840 | Subsequent Event |  |  |  |  |  |  |
Recent Accounting Pronouncements |  |  |  |  |  |  |
Operating lease asset |  |  |  |  | $ 68,000 |  |
Operating lease liability |  |  |  |  | $ 68,000 |  |
ASC 606 Adjustment | ASC 606 |  |  |  |  |  |  |
Recent Accounting Pronouncements |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  | $ 200 |
Minimum |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 | $ 1,500 | $ 500 | 1,500 | 1,500 |  |  |
Provisions |  | 1,800 | 0 | 100 |  |  |
Write-offs/Recoveries |  | 0 | (1,000) | (100) |  |  |
Balance at End of Year |  | 2,300 | 500 | 1,500 |  |  |
Continuing operations |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Stock-based compensation expense, amount recognized in the consolidated financial statements |  | 7,200 | 7,800 | 5,100 |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Stock-based compensation expense, amount recognized in the consolidated financial statements |  | $ 7,200 | 7,800 | $ 5,100 |  |  |
Kratos Government Solutions (KGS) | Building facility |  |  |  |  |  |  |
Property and Equipment, Net |  |  |  |  |  |  |
Carrying value of building held-for-sale |  |  |  |  |  |  | $ 1,900
Remeasured fair value of building held-for-sale |  |  | 500 |  |  |  |
Impairment loss on building reclassified from held-for-sale to held |  |  | $ 1,400 |  |  |  |
Stock options | Maximum |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Share-based incentive award vesting period |  | 6 years |  |  |  |  |

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