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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Valuation allowance - deferred tax assets |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 3,254 | $ 2,976 | $ 2,186
Charged to costs and expenses | 63 | 278 | 790
Charged to Other Accounts | 0 | 0 | 0
Deductions | 0 | 0 | 0
Balance at end of period | 3,317 | 3,254 | 2,976
Reserve for future credit returns and pricing adjustments |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 1,311 | 1,131 | 930
Charged to costs and expenses | 21,030 | 20,205 | 17,087
Charged to Other Accounts | 0 | 0 | 0
Deductions | (19,220) | (20,025) | (16,886)
Balance at end of period | $ 3,121 | $ 1,311 | $ 1,131

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