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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
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 | $ 900 | $ 600 | $ 2,619 | $ 1,618
Selling, General, and Administrative Expenses [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense, approximately | $ 2,500 | $ 2,200 | $ 6,900 | $ 5,500

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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