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Segments Information - Summary of Business Segment Information (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]
Total 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]
Total 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
Critical Infrastructure
Segment Reporting Information [Line Items]
Total 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

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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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+ References

No definition available.

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