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Segments Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 29, 2017
Segment Reporting Information [Line Items]
Revenues	$ 1,037,388	$ 1,023,277	$ 989,742	$ 904,405	$ 928,940	$ 976,157	$ 900,732	$ 754,679	$ 3,954,812	$ 3,560,508	$ 3,017,011
Federal Solution Segment
Segment Reporting Information [Line Items]
Revenues	500,423	486,175	478,497	422,812	402,882	443,725	341,065	291,335	1,887,907	1,479,007	1,079,906
Federal Solution Segment | Cyber & Intelligence
Segment Reporting Information [Line Items]
Revenues									351,828	255,447	184,771
Federal Solution Segment | Defense
Segment Reporting Information [Line Items]
Revenues									577,109	431,059	291,358
Federal Solution Segment | Mission Solutions
Segment Reporting Information [Line Items]
Revenues									317,802	360,969	291,933
Federal Solution Segment | Engineered Systems
Segment Reporting Information [Line Items]
Revenues									497,793	431,532	311,844
Federal Solution Segment | Geospatial
Segment Reporting Information [Line Items]
Revenues									143,375
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenues	$ 536,965	$ 537,102	$ 511,245	$ 481,593	$ 526,058	$ 532,432	$ 559,667	$ 463,344	2,066,905	2,081,501	1,937,105
Critical Infrastructure | Connect Communities
Segment Reporting Information [Line Items]
Revenues									619,220	656,513	602,975
Critical Infrastructure | Mobility Solutions
Segment Reporting Information [Line Items]
Revenues									1,120,563	1,183,863	1,102,725
Critical Infrastructure | Industrial
Segment Reporting Information [Line Items]
Revenues									$ 327,122	$ 241,125	$ 231,405

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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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