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PA Consulting Business Combination - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 02, 2021 | Jul. 02, 2021 | Oct. 01, 2021 | Oct. 02, 2020 | Sep. 27, 2019
Business Acquisition [Line Items] |  |  |  |  |
Pre-tax transaction costs |  |  | $ 36,800 |  |
Preferred redeemable noncontrolling interests redemption value adjustment |  | $ 57,300 | 57,307 | $ 0 | $ 0
Preference share effect on basic earnings per share (in dollars per share) |  | $ 0.44 |  |  |
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 |  |  |  |
Consideration received from acquiree | 261,000 |  |  |  |
Fair value of redeemable noncontrolling interests at acquisition | $ 582,400 |  |  |  |
Cash in employee benefit trust |  |  | $ 12,300 |  |
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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