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Property and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Property Plant And Equipment [Abstract]        
Depreciation and amortization expense for property and equipment $ 1.6 $ 1.1 $ 4.5 $ 2.9