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

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Operating Income (Loss), Related to Retrofits

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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-Topic 805

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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-Topic 230

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-Subparagraph (b)

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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No definition available.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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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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The net result for the period of deducting operating expenses from operating revenues.

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No definition available.

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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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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 28, 2014 Segment	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 28, 2014 Segment	Dec. 29, 2013 Segment	Dec. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable segments	3us-gaap_NumberOfReportableSegments								3us-gaap_NumberOfReportableSegments	2us-gaap_NumberOfReportableSegments
Segment Reporting Information, Operating Income (Loss) [Abstract]
Service revenues									$ 390.8us-gaap_SalesRevenueServicesNet	$ 443.6us-gaap_SalesRevenueServicesNet	$ 450.0us-gaap_SalesRevenueServicesNet
Product sales									477.2us-gaap_SalesRevenueGoodsNet	507.0us-gaap_SalesRevenueGoodsNet	519.2us-gaap_SalesRevenueGoodsNet
Revenue from foreign subsidiaries									868.0us-gaap_Revenues	950.6us-gaap_Revenues	969.2us-gaap_Revenues
Depreciation and amortization									39.1	53.4	58.0
Total operating income (loss) from continuing operations	10.7us-gaap_OperatingIncomeLoss	1.2us-gaap_OperatingIncomeLoss	4.7us-gaap_OperatingIncomeLoss	3.3us-gaap_OperatingIncomeLoss	5.4us-gaap_OperatingIncomeLoss	6.1us-gaap_OperatingIncomeLoss	8.9us-gaap_OperatingIncomeLoss	11.4us-gaap_OperatingIncomeLoss	19.9us-gaap_OperatingIncomeLoss	31.8us-gaap_OperatingIncomeLoss	(49.7)us-gaap_OperatingIncomeLoss
Revenue from foreign subsidiaries, percentage									13.00%	11.00%	12.00%
Impairment of goodwill and intangible assets									0	0	96.6
Merger and acquisition expenses (benefits)									0.2	(3.8)	(2.7)
Total assets	1,138.8us-gaap_Assets				1,216.6us-gaap_Assets				1,138.8us-gaap_Assets	1,216.6us-gaap_Assets
Unmanned Systems
Segment Reporting Information, Operating Income (Loss) [Abstract]
Service revenues									0	0	0
Product sales									81.5	121.6	92.3
Revenue from foreign subsidiaries									81.5	121.6	92.3
Depreciation and amortization									7.3	20.3	9.0
Total operating income (loss) from continuing operations									(9.6)	(16.9)	3.5
Total assets	173.2				178.1				173.2	178.1
Operating loss related to retrofits									3.1	7.6
Kratos Government Solutions
Segment Reporting Information [Line Items]
Number of reportable segments	2
Segment Reporting Information, Operating Income (Loss) [Abstract]
Service revenues									207.4	233.9	264.0
Product sales									382.7	385.4	426.9
Revenue from foreign subsidiaries									590.1	619.3	690.9
Depreciation and amortization									29.8	29.6	45.5
Total operating income (loss) from continuing operations									38.5	43.3	(45.0)
Impairment of goodwill and intangible assets											83.7
Total assets	802.6				847.5				802.6	847.5
Assets of foreign subsidiaries	98.2				95.9				98.2	95.9
Public Safety & Security
Segment Reporting Information, Operating Income (Loss) [Abstract]
Service revenues									183.4	209.7	186.0
Product sales									13.0	0	0
Revenue from foreign subsidiaries									196.4	209.7	186.0
Depreciation and amortization									2.0	3.5	3.5
Total operating income (loss) from continuing operations									(4.4)	8.3	(2.5)
Intangible assets impairment charge											12.9
Total assets	100.2				122.6				100.2	122.6
Corporate activities
Segment Reporting Information, Operating Income (Loss) [Abstract]
Total operating income (loss) from continuing operations									(4.6)	(2.9)	(5.7)
Merger and acquisition expenses (benefits)										(2.0)	(2.7)
Settlement with one of the Company's D&O insurance carriers										3.1
Total assets	62.8				68.4				62.8	68.4
Non-US
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue from foreign subsidiaries									$ 113.5	$ 100.9	$ 116.2