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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions | Sep. 27, 2020 | Dec. 29, 2019
--- | --- | ---
Goodwill [Line Items] |  |
Gross value | $ 728.6 | $ 708.9
Less accumulated impairment | 253.3 | 253.3
Net | 475.3 | 455.6
Kratos Government Solutions |  |
Goodwill [Line Items] |  |
Gross value | 607.9 | 597.8
Less accumulated impairment | 239.5 | 239.5
Net | 368.4 | 358.3
Unmanned Systems |  |
Goodwill [Line Items] |  |
Gross value | 120.7 | 111.1
Less accumulated impairment | 13.8 | 13.8
Net | $ 106.9 | $ 97.3

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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