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Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) contract | Dec. 31, 2017 USD ($) Segment | Dec. 25, 2016 USD ($)
Goodwill [Line Items] |  |  |
Number of operating segments | Segment |  | 4 |
Goodwill | $ 461.2 | $ 461.2 | $ 485.4
Intangible assets, net | $ 22.0 | 22.0 | 32.6
Number of lost contract opportunities | contract | 2 |  |
Lost contract opportunities period | 5 years |  |
Carrying amounts of goodwill by reportable segment |  |  |
Gross value | $ 732.8 | 732.8 | 732.8
Less accumulated impairment | 271.6 | 271.6 | 247.4
Net | 461.2 | 461.2 | 485.4
Public Safety & Security |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 35.6 | 35.6 | 35.6
Carrying amounts of goodwill by reportable segment |  |  |
Gross value | 53.9 | 53.9 | 53.9
Less accumulated impairment | 18.3 | 18.3 | 18.3
Net | 35.6 | 35.6 | 35.6
Kratos Unmanned Systems (US) |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 97.3 | 97.3 | 97.3
Carrying amounts of goodwill by reportable segment |  |  |
Gross value | 111.1 | 111.1 | 111.1
Less accumulated impairment | 13.8 | 13.8 | 13.8
Net | 97.3 | 97.3 | 97.3
Kratos Government Solutions (KGS) |  |  |
Goodwill [Line Items] |  |  |
Impairment of goodwill | 24.2 | 24.2 |
Goodwill | 328.3 | 328.3 | 352.5
Carrying amounts of goodwill by reportable segment |  |  |
Gross value | 567.8 | 567.8 | 567.8
Less accumulated impairment | 239.5 | 239.5 | 215.3
Net | $ 328.3 | $ 328.3 | $ 352.5

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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