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PA Consulting Business Combination - Change in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Oct. 01, 2021 | Oct. 02, 2020
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Noncontrolling interests - distributions and other | $ (27,248) | $ (44,372) | $ (41,032)
Noncontrolling interest, Ending balance | 44,336 | 34,796 |
Preferred redeemable noncontrolling interests redemption value adjustment | 0 | $ (57,307) | $ 0
PA Consulting Employees |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Noncontrolling interest, Beginning balance | 657,722 |  |
Accrued Preferred Dividend to Preference Shareholders | 67,598 |  |
Noncontrolling interests - distributions and other | (67,598) |  |
Net earnings attributable to redeemable noncontrolling interest to Common Shareholders | 34,585 |  |
Redeemable Noncontrolling interests redemption value adjustment | 27,657 |  |
Repurchase of redeemable noncontrolling interests | (53,834) |  |
Issuance of redeemable noncontrolling interests | 54,884 |  |
Cumulative translation adjustment and other | (88,492) |  |
Noncontrolling interest, Ending balance | $ 632,522 |  |

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