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Leases - Summary of Supplemental Information Related to Operating Lease (Detail)
$ in Thousands
12 Months Ended
Sep. 30, 2020
USD ($)
Disclosure of Supplemental Cash Flow Information Related to Operating Lease [Line Items]  
Lease liability payments $ 88,272
Lease assets obtained in exchange for liabilities $ 87,820
Weighted average remaining lease term—Operating leases 6 years 9 months 18 days
Weighted average discount rate—Operating leases 3.50%