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v3.22.2.2

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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