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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Valuation allowance - deferred tax assets |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 2,976 | $ 2,186 | $ 4,372
Charged to costs and expenses | 278 | 790 | (2,186)
Charged to Other Accounts | 0 | 0 | 0
Deductions | 0 | 0 | 0
Balance at end of period | 3,254 | 2,976 | 2,186
Reserve for future credit returns and pricing adjustments |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 1,131 | 930 | 1,476
Charged to costs and expenses | 20,205 | 17,087 | 15,477
Charged to Other Accounts | 0 | 0 | 0
Deductions | (20,025) | (16,886) | (16,023)
Balance at end of period | $ 1,311 | $ 1,131 | $ 930

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