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Property and Equipment - Component of Property and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Property, Plant and Equipment [Abstract]    
Property and equipment $ 249,550 $ 244,816
Less: accumulated depreciation and amortization 143,409 139,412
Property and equipment, net $ 106,141 $ 105,404