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Segment Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 28, 2018	Sep. 30, 2019	Sep. 28, 2018
Segment Reporting Information [Line Items]
Revenues	$ 1,023,277	$ 976,157	$ 2,917,424	$ 2,631,568
Federal Solution Segment
Segment Reporting Information [Line Items]
Revenues	486,175	443,725	1,387,484	1,076,125
Federal Solution Segment | Cyber & Intelligence
Segment Reporting Information [Line Items]
Revenues	90,429	68,895	247,710	177,838
Federal Solution Segment | Defense
Segment Reporting Information [Line Items]
Revenues	144,160	133,259	425,603	297,318
Federal Solution Segment | Mission Solutions
Segment Reporting Information [Line Items]
Revenues	87,936	122,780	237,914	280,902
Federal Solution Segment | Engineered Systems
Segment Reporting Information [Line Items]
Revenues	129,989	118,791	367,542	320,067
Federal Solution Segment | Geospatial
Segment Reporting Information [Line Items]
Revenues	33,661	0	108,715	0
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenues	537,102	532,432	1,529,940	1,555,443
Critical Infrastructure | Connected Communities
Segment Reporting Information [Line Items]
Revenues	151,779	165,529	459,277	491,444
Critical Infrastructure | Mobility Solutions
Segment Reporting Information [Line Items]
Revenues	286,199	300,523	836,779	894,796
Critical Infrastructure | Industrial
Segment Reporting Information [Line Items]
Revenues	$ 99,124	$ 66,380	$ 233,884	$ 169,203

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- Definition

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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No definition available.

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