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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Net proceeds from issuance of common stock under incentive compensation and employee purchase plans $ 600 $ 500 $ 1,618 $ 2,341
Selling, General, and Administrative Expenses [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense, approximately $ 2,200 $ 1,800 $ 5,500 $ 5,000