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Leases - Summary of Components of Lease Cost (Detail)
$ in Thousands
3 Months Ended
Dec. 31, 2020
USD ($)
Finance Leases:  
Total finance lease cost $ 478
Operating Leases:  
Operating lease cost 2,459
Total lease cost 2,937
Selling, General and Administrative Expense [Member]  
Finance Leases:  
Amortization of finance lease assets 312
Operating Leases:  
Operating lease cost 1,894
Variable lease cost 237
Short-term lease cost 9
Cost of Revenue [Member]  
Finance Leases:  
Amortization of finance lease assets 114
Operating Leases:  
Operating lease cost 319
Interest Expense [Member]  
Finance Leases:  
Interest on finance lease liabilities $ 52