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Leases - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Leases [Abstract] |  |  |  |
Weighted average remaining lease term (years) | 19 years |  | 19 years |
Operating lease expense | $ 9.3 | $ 8.9 | $ 25.4 | $ 25.1
Operating lease renewal term | 25 years |  | 25 years |
Weighted average discount rate | 6.60% |  | 6.60% |

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