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PA Consulting Redeemable Noncontrolling Interests - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 26, 2025 | Sep. 27, 2024 | Sep. 26, 2025 | Sep. 27, 2024 | Sep. 29, 2023 | Mar. 02, 2021
Business Combination [Line Items] |  |  |  |  |  |
Repurchase of redeemable noncontrolling interests |  |  | $ 10,449,000 | $ 55,344,000 | $ 92,939,000 |
Proceeds from issuances of redeemable noncontrolling interests |  |  | 0 | 19,761,000 | 34,016,000 |
Temporary equity, fair value adjustment of redeemable noncontrolling interest |  |  | $ 0.0 | (0.10) |  |
Preference share effect on basic earnings per share (in dollars per share) | $ 0.01 | $ 0.02 |  |  |  |
Award vesting percentage |  |  | 40.00% |  |  |
Fair value of awards not yet recognized | $ 142,100,000 |  | $ 142,100,000 |  |  |
Fair value of such grants anticipated to vest |  |  | 60.00% |  |  |
PA Consulting Group Limited |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Allocated share-based compensation expense |  |  | $ 75,300,000 | 13,400,000 |  |
Cash in employee benefit trust | 1,400,000 | $ 2,100,000 | 1,400,000 | 2,100,000 |  |
Equity Based Incentive Grants |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Accrued cumulative expense associated with the vested grants | $ 103,800,000 | $ 28,400,000 | $ 103,800,000 | 28,400,000 |  |
PA Consulting Employees |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Proceeds from issuances of redeemable noncontrolling interests |  |  |  | $ 19,800,000 | $ 34,000,000 |
Ownership interest of employees | 71.00% | 70.00% | 71.00% | 70.00% |  | 35.00%

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