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PA Consulting Business Combination - Narrative (Details) - USD ($) $ in Thousands		9 Months Ended
	Mar. 02, 2021	Jun. 30, 2023	Jul. 01, 2022	Sep. 30, 2022
Business Acquisition [Line Items]
Repurchase of redeemable noncontrolling interests		$ 90,425	$ 46,074
Proceeds from issuances of redeemable noncontrolling interests		34,771	49,738
PA Consulting Employees
Business Acquisition [Line Items]
Ownership interest of employees	35.00%
Proceeds from issuances of redeemable noncontrolling interests		34,800	49,700
PA Consulting Group Limited
Business Acquisition [Line Items]
Percentage of outstanding shares of common and preferred stock acquired	65.00%
Consideration transferred	$ 1,700,000
Fair value of redeemable noncontrolling interests	$ 582,400
Allocated share-based compensation expense		5,100	$ 1,600
Cash in employee benefit trust		$ 2,000		$ 13,700

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