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Segment Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 1,418,571	$ 1,134,370	$ 3,948,523	$ 3,092,160
Federal Solution Segment
Segment Reporting Information [Line Items]
Revenues	780,114	620,416	2,177,457	1,649,601
Federal Solution Segment | Defense And Intelligence
Segment Reporting Information [Line Items]
Revenues	398,632	351,419	1,144,320	1,037,244
Federal Solution Segment | Engineered Systems
Segment Reporting Information [Line Items]
Revenues	381,482	268,997	1,033,137	612,357
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenues	638,457	513,954	1,771,066	1,442,559
Critical Infrastructure | Connected Communities
Segment Reporting Information [Line Items]
Revenues	208,446	184,288	561,512	517,725
Critical Infrastructure | Mobility Solutions
Segment Reporting Information [Line Items]
Revenues	$ 430,011	$ 329,666	$ 1,209,554	$ 924,834

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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
-Topic 924
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Section 50
-Paragraph 4
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