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PA Consulting Redeemable Noncontrolling Interests - Schedule of Change in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 27, 2024 | Dec. 29, 2023
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |
Redeemable noncontrolling interest, beginning balance | $ 17,836 |
Attribution of Preferred Dividend to Common Shareholders | (2,309) | $ (4,512)
Redeemable noncontrolling interest, ending balance | 21,607 |
PA Consulting Employees |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |
Redeemable noncontrolling interest, beginning balance | 820,182 |
Accrued Preferred Dividend to Preference Shareholders | 18,867 |
Attribution of Preferred Dividend to Common Shareholders | (18,867) |
Net earnings attributable to redeemable noncontrolling interests to Common Shareholders | 7,047 |
Redeemable Noncontrolling interests redemption value adjustment | (54) |
Repurchase of redeemable noncontrolling interests | (4,712) |
Cumulative translation adjustment and other | (27,870) |
Redeemable noncontrolling interest, ending balance | $ 794,593 |

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