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Acquisitions - Pro Forma Financial Information (Details) - CPI ASC Signal Division, Inc. $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 29, 2020 USD ($) $ / shares
Business Acquisition [Line Items]
Pro forma revenues	$ 179.1
Pro forma net loss before tax	(5.2)
Pro forma net loss	$ (4.3)
Basic pro forma income per share attributable to Kratos (USD per share) | $ / shares	$ (0.04)
Diluted pro forma income per share attributable to Kratos (USD per share) | $ / shares	$ (0.04)

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Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Before Tax

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-Publisher FASB
-Name Accounting Standards Codification
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