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Segment Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,134,370	$ 956,050	$ 3,092,160	$ 2,710,103
Federal Solution Segment
Segment Reporting Information [Line Items]
Revenues	620,416	499,291	1,649,601	1,394,035
Federal Solution Segment | Defense And Intelligence
Segment Reporting Information [Line Items]
Revenues	351,419	332,080	1,037,244	929,044
Federal Solution Segment | Engineered Systems
Segment Reporting Information [Line Items]
Revenues	268,997	167,211	612,357	464,991
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenues	513,954	456,759	1,442,559	1,316,068
Critical Infrastructure | Connected Communities
Segment Reporting Information [Line Items]
Revenues	184,288	162,960	517,725	444,848
Critical Infrastructure | Mobility Solutions
Segment Reporting Information [Line Items]
Revenues	$ 329,666	$ 293,799	$ 924,834	$ 871,220

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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