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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
	Feb. 04, 2022 USD ($)	Nov. 19, 2021 USD ($)	Mar. 02, 2021 USD ($)	Nov. 24, 2020 USD ($)	Mar. 06, 2020 USD ($)	Mar. 06, 2020 GBP (£)	Apr. 26, 2019 USD ($) shares	Sep. 30, 2022 USD ($)	Sep. 30, 2022 operatingSegment	Sep. 30, 2022 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
Redeemable noncontrolling interests had a fair value			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]
Enterprise value on debt-free, cash-free basis (USD, GBP)					$ 317.9	£ 246
Business combination, cash acquired					$ 24.3
StreetLightData, Inc.
Business Acquisition [Line Items]
Business combination consideration paid in cash	$ 190.8
Business combination, cash acquired	7.3
Business combination consideration equity issued	0.9
Money stock options	5.2
Transferred liabilities incurred	$ 1.0
BlackLynx
Business Acquisition [Line Items]
Business combination consideration paid in cash		$ 235.4
Long term liabilities		5.3
Business combination, cash acquired		$ 5.1

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