Segment Information - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2022 USD ($)	Jun. 26, 2022 USD ($)	Sep. 25, 2022 USD ($) segment	Sep. 26, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Litigation related charges		$ 5.5	$ 5.5	$ 0.0
Company's C5ISR
Segment Reporting Information [Line Items]
Litigation related charges			3.4
Company's Training Solutions
Segment Reporting Information [Line Items]
Litigation related charges			3.0
Unmanned Systems
Segment Reporting Information [Line Items]
Litigation related charges			5.5
Kratos Government Solutions
Segment Reporting Information [Line Items]
Litigation related charges	$ 6.4		$ 6.4