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Organization and Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 27, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 206.4	$ 202.0	$ 170.4	$ 168.9	$ 185.1	$ 184.1	$ 187.9	$ 160.4	$ 747.7	$ 717.5	$ 618.0
Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total revenues									560.7	556.1
Kratos Government Solutions | U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues									375.9	368.6
Kratos Government Solutions | International
Disaggregation of Revenue [Line Items]
Total revenues									123.8	111.4
Kratos Government Solutions | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total revenues									61.0	76.1
Kratos Government Solutions | Fixed price
Disaggregation of Revenue [Line Items]
Total revenues									437.6	469.4
Kratos Government Solutions | Cost plus fee
Disaggregation of Revenue [Line Items]
Total revenues									89.1	54.3
Kratos Government Solutions | Time and materials
Disaggregation of Revenue [Line Items]
Total revenues									34.0	32.4
Unmanned Systems
Disaggregation of Revenue [Line Items]
Total revenues									187.0	161.4
Unmanned Systems | U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues									170.5	138.8
Unmanned Systems | International
Disaggregation of Revenue [Line Items]
Total revenues									15.7	21.1
Unmanned Systems | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total revenues									0.8	1.5
Unmanned Systems | Fixed price
Disaggregation of Revenue [Line Items]
Total revenues									126.9	126.2
Unmanned Systems | Cost plus fee
Disaggregation of Revenue [Line Items]
Total revenues									57.1	33.8
Unmanned Systems | Time and materials
Disaggregation of Revenue [Line Items]
Total revenues									$ 3.0	$ 1.4

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