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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total Revenues	$ 184.1	$ 159.4	$ 532.4	$ 453.6
Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	138.4	126.1	409.3	356.9
Kratos Government Solutions | U.S. Government
Disaggregation of Revenue [Line Items]
Total Revenues	89.1	90.8	272.2	245.3
Kratos Government Solutions | International
Disaggregation of Revenue [Line Items]
Total Revenues	29.6	22.3	82.9	66.7
Kratos Government Solutions | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total Revenues	19.7	13.0	54.2	44.9
Kratos Government Solutions | Fixed price
Disaggregation of Revenue [Line Items]
Total Revenues	114.6	108.5	346.2	311.8
Kratos Government Solutions | Cost plus fee
Disaggregation of Revenue [Line Items]
Total Revenues	15.6	10.3	39.1	24.7
Kratos Government Solutions | Time and materials
Disaggregation of Revenue [Line Items]
Total Revenues	8.2	7.3	24.0	20.4
Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	45.7	33.3	123.1	96.7
Unmanned Systems | U.S. Government
Disaggregation of Revenue [Line Items]
Total Revenues	37.1	30.0	104.8	83.0
Unmanned Systems | International
Disaggregation of Revenue [Line Items]
Total Revenues	8.3	2.7	17.3	13.0
Unmanned Systems | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total Revenues	0.3	0.6	1.0	0.7
Unmanned Systems | Fixed price
Disaggregation of Revenue [Line Items]
Total Revenues	38.9	25.9	100.1	76.9
Unmanned Systems | Cost plus fee
Disaggregation of Revenue [Line Items]
Total Revenues	6.6	7.1	22.1	18.5
Unmanned Systems | Time and materials
Disaggregation of Revenue [Line Items]
Total Revenues	$ 0.2	$ 0.3	$ 0.9	$ 1.3

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+ References

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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