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Leases - Summary of Total Lease Costs and Other Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Lease cost:      
Operating lease cost $ 23,637 $ 23,186 $ 25,185
Short-term lease cost 818 1,024 826
Variable lease cost 5,598 7,400 5,867
Total lease cost 30,053 31,610 31,878
Cash paid for amounts included in the measurement of lease liabilities      
Operating cash flows from operating leases 23,622 22,513 24,894
Right-of-use assets obtained in exchange for new operating lease liabilities $ 15,994 $ 16,366 $ 15,894
Weighted-average remaining lease term - operating leases 5 years 7 months 6 days 6 years 1 month 6 days 6 years 7 months 6 days
Weighted-average discount rate - operating leases 5.90% 5.40% 4.80%