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Basis of Presentation (Details) £ in Millions, shares in Millions						3 Months Ended		8 Months Ended
	Mar. 02, 2021 USD ($)	Nov. 24, 2020 USD ($)	Mar. 06, 2020 USD ($)	Mar. 06, 2020 GBP (£)	Apr. 26, 2019 USD ($) shares	Jul. 02, 2021 USD ($)	Jun. 26, 2020 USD ($)	Dec. 31, 2019 shares	Oct. 02, 2020 USD ($)
Worley Stock
Business Acquisition [Line Items]
Ordinary shares included in purchase price (in shares) | shares					58.2			51.4
Worley
Business Acquisition [Line Items]
Consideration transferred					$ 3,400,000,000
Consideration paid in cash					$ 2,800,000,000
Discontinued Operations | Worley
Business Acquisition [Line Items]
Assets held for sale									$ 0
PA Consulting Employees
Business Acquisition [Line Items]
Ownership interest of employees	35.00%
PA Consulting Group Limited
Business Acquisition [Line Items]
Percentage of outstanding shares of common and preferred stock acquired	65.00%
Consideration transferred	$ 1,700,000,000
Consideration received from acquiree	267,000,000
Compensation expense forfeited						$ 5,600,000
Compensation expense						261,000,000
Fair value of redeemable noncontrolling interests at acquisition on March 2, 2021	582,400,000
Cash and cash equivalents	$ 134,900,000
Buffalo Group
Business Acquisition [Line Items]
Consideration transferred		$ 190,100,000
Consideration paid in cash		182,400,000
Contingent consideration		7,700,000				$ 3,900,000
Change in amount of contingent consideration							$ 3,800,000
Debt assumed		7,700,000
Cash and cash equivalents		$ 8,400,000
John Wood Group
Business Acquisition [Line Items]
Enterprise value on debt-free, cash-free basis			$ 317,900,000	£ 246
Cash and cash equivalents			$ 24,300,000

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