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Leases - Supplemental Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Sep. 30, 2022
Leases [Abstract]    
Operating lease right-of-use assets $ 216,293 $ 227,475
Operating lease liabilities, current 43,215 42,523
Operating lease liabilities, long-term 259,916 272,376
Total lease liabilities $ 303,131 $ 314,899
Weighted average remaining lease term (in years) 8 years 9 months 18 days 9 years 2 months 12 days
Weighted average discount rate 2.73% 2.66%