Goodwill - Summary of Changes in Carrying Value of Goodwill by Reporting Segment (Details) $ in Thousands	9 Months Ended
Sep. 30, 2026 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 2,186,650
Acquisitions	236,617
Foreign Exchange	(1,678)
Ending Balance	2,421,589
Federal Solutions
Goodwill [Line Items]
Beginning Balance	1,861,218
Acquisitions	236,541
Foreign Exchange	0
Ending Balance	2,097,759
Critical Infrastructure
Goodwill [Line Items]
Beginning Balance	325,432
Acquisitions	76
Foreign Exchange	(1,678)
Ending Balance	$ 323,830

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details