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Acquisitions - Schedule of Estimated Contingent Consideration (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jul. 02, 2023 | Jun. 30, 2024 | Jul. 02, 2023
All acquisitions |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Aggregate maximum of contingent consideration | $ 128,573 | $ 120,320 | $ 128,573 | $ 120,320
Contingent Consideration |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 74,579 | 88,082 | 73,422 | 65,566
Estimated earn-out liabilities for acquisitions | 1,138 | 0 | 23,038 | 12,248
Payments of contingent consideration | (7,000) | (13,078) | (29,112) | (15,078)
Adjustments to fair value recorded in earnings | 500 | 0 | 477 | 8,477
Interest accretion expense | 1,038 | 707 | 1,953 | 1,919
Effect of foreign currency exchange rate changes | 28 | 888 | 505 | 3,467
Ending balance | $ 70,283 | $ 76,599 | $ 70,283 | $ 76,599

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