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Leases - Summary of Supplemental Information Related to Operating Lease (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Supplemental Information Related to Operating Lease transactions [Line Items]    
Lease liability payments $ 79,495 $ 79,028
Lease assets obtained in exchange for liabilities $ 15,115 $ 14,580
Weighted average remaining lease term — Operating leases 5 years 10 months 24 days 6 years 4 months 24 days
Weighted average discount rate — Operating leases 3.50% 3.70%