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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
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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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