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PA Consulting Business Combination - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				9 Months Ended
	Mar. 02, 2021	Jul. 01, 2022	Apr. 01, 2022	Dec. 31, 2021	Jul. 02, 2021	Jul. 01, 2022	Jul. 02, 2021
Business Acquisition [Line Items]
Repurchase of redeemable noncontrolling interests		$ 11,000		$ 35,100		$ 46,074	$ 0
Proceeds from issuances of redeemable noncontrolling interests						49,738	0
Redemption value adjustment		0			$ 57,307	0	$ 57,307
Redemption value adjustment effect on EPS (in usd per share)					$ 0.44
PA Consulting Employees
Business Acquisition [Line Items]
Ownership interest of employees	35.00%
Proceeds from issuances of redeemable noncontrolling interests		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
Consideration received from acquiree	261,000		$ 267,000
Consideration forfeited by former employees		6,000
Redeemable Noncontrolling interests	$ 582,400
Cash in employee benefit trust		$ 12,000				$ 12,000
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names
Business Acquisition [Line Items]
Useful life of acquired intangible assets	12 years
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Minimum
Business Acquisition [Line Items]
Useful life of acquired intangible assets	9 years
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Maximum
Business Acquisition [Line Items]
Useful life of acquired intangible assets	20 years

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