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PA Consulting Business Combination - Narrative (Details) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 02, 2021 | Dec. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2022
Business Acquisition [Line Items] |  |  |  |
Repurchase of redeemable noncontrolling interests |  | $ 58,353,000 | $ 35,095,000 |
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 |  |  |
Fair value of redeemable noncontrolling interests | 582,400,000 |  |  |
Goodwill recognized expected to be deductible for tax purposes | $ 0 |  |  |
Allocated share-based compensation expense |  | 4,300,000 | $ 200,000 |
Cash in employee benefit trust |  | $ 2,300,000 |  | $ 13,700,000
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of acquired intangible assets | 12 years |  |  |
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of acquired intangible assets | 9 years |  |  |
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life of acquired intangible assets | 20 years |  |  |

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