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Description of Business and Basis of Presentation - Basis of Presentation, Acquisition Narrative (Details) £ in Millions, shares in Millions, $ in Millions							3 Months Ended	12 Months Ended
	Mar. 02, 2021 USD ($)	Nov. 24, 2020 USD ($)	Mar. 06, 2020 USD ($)	Mar. 06, 2020 GBP (£)	Jun. 12, 2019 USD ($)	Apr. 26, 2019 USD ($) shares	Oct. 01, 2021 USD ($)	Oct. 01, 2021 operatingSegment	Oct. 01, 2021 segment
Business Acquisition [Line Items]
Number of operating and reporting segments								3	3
Worley Stock
Business Acquisition [Line Items]
Equity instrument consideration, shares | shares						58.2
ECR Business
Business Acquisition [Line Items]
Consideration transferred						$ 3,400.0
Business combination consideration paid in cash						$ 2,800.0
PA Consulting Group Limited
Business Acquisition [Line Items]
Percentage of outstanding shares of common and preferred stock acquired	65.00%
Consideration transferred	$ 1,700.0
Compensation expense							$ 261.0
Fair value of redeemable noncontrolling interests at acquisition	582.4
Business combination, cash acquired	$ 134.9
Buffalo Group
Business Acquisition [Line Items]
Consideration transferred		$ 190.1
Business combination consideration paid in cash		182.4
Contingent consideration		7.7
Long term liabilities		7.7
Business combination, cash acquired		$ 8.4
John Wood Group
Business Acquisition [Line Items]
Long term liabilities			$ 28.5
Enterprise value on debt-free, cash-free basis (USD, GBP)			317.9	£ 246
Business combination, cash acquired			$ 24.3
KeyW Holding Corporation
Business Acquisition [Line Items]
Percentage of outstanding shares of common and preferred stock acquired					100.00%
Consideration transferred					$ 902.6
Business combination consideration paid in cash					604.2
Business combination, cash acquired					29.1
Business combination, short term debt					$ 298.4

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