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PA Consulting Business Combination - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 02, 2021 | Sep. 30, 2022 | Oct. 01, 2021 | Oct. 02, 2020
Business Acquisition [Line Items] |  |  |  |
Preferred redeemable noncontrolling interests redemption value adjustment |  | $ 0 | $ (57,307) | $ 0
Preference share effect on basic earnings per share (in dollars per share) |  |  | $ 0.44 |
Proceeds from issuances of redeemable noncontrolling interests |  | 49,742 | $ 0 | $ 0
PA Consulting Employees |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership interest of employees | 35.00% |  |  |
Proceeds from issuances of redeemable noncontrolling interests |  | 49,700 |  |
PA Consulting Group Limited |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of outstanding shares of common and preferred stock acquired | 65.00% |  |  |
Remaining percentage of outstanding shares of common and preferred stock acquired | 35.00% |  |  |
Consideration transferred | $ 1,700,000 |  |  |
Consideration received from acquiree | 261,000 |  |  |
Redeemable noncontrolling interests had a fair value | 582,400 |  |  |
Goodwill recognized expected to be deductible for tax purposes | $ 0 |  |  |
Cash in employee benefit trust |  | 13,700 |  |
Allocated share-based compensation expense |  | $ 3,300 | $ 400 |
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 12 years |  |  |
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 9 years |  |  |
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 20 years |  |  |

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