Entity Wide Disclosure on Geographic Areas, Assets in Foreign Countries

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Entity Wide Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries, Percentage

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Integration Project Expense

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Operating Income (Loss), Related to Retrofits

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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-Section S99
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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Segment Information - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Segment Information - Narrative (Details) $ in Millions	Dec. 31, 2017 USD ($)	Oct. 01, 2017 Segment	Dec. 31, 2017 USD ($) Segment	Dec. 25, 2016 USD ($)	Dec. 27, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment		3	3
Total revenues			$ 751.9	$ 668.7	$ 657.1
Percentage of foreign revenue to total revenue (as a percent)			11.00%	12.00%	11.00%
Litigation related charges			$ 0.0	$ 1.7	$ 0.0
Unmanned Systems
Segment Reporting Information [Line Items]
Loss accrual				18.7
Costs related to retrofits					5.7
Public Safety & Security
Segment Reporting Information [Line Items]
Litigation related charges				1.9
Integration Project Expense				4.1
Kratos Government Solutions
Segment Reporting Information [Line Items]
Impairment of goodwill	$ 24.2		24.2
Business exit costs				9.2
Assets of foreign subsidiaries	$ 116.7		116.7	113.7	106.2
Non-US
Segment Reporting Information [Line Items]
Total revenues			$ 84.7	$ 80.1	$ 73.2