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Goodwill and Intangible Assets - Amortization Expense Associated with Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]        
Amortization expense of intangible assets $ 810 $ 1,048 $ 2,692 $ 4,046
Completed Technology        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense of intangible assets 257 406 902 1,444
Customer Contracts [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense of intangible assets 510 561 1,659 2,359
Trade Names [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense of intangible assets 0 37 0 112
Noncompete Agreements [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense of intangible assets $ 43 $ 44 $ 131 $ 131