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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Valuation allowance - deferred tax assets |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 2,186 | $ 4,372 | $ 3,810
Charged to costs and expenses | 790 | (2,186) | 670
Charged to Other Accounts | 0 | 0 | 0
Deductions | 0 | 0 | 108
Balance at end of period | 2,976 | 2,186 | 4,372
Reserve for future credit returns and pricing adjustments |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 930 | 1,476 | 2,677
Charged to costs and expenses | 17,087 | 15,477 | 17,816
Charged to Other Accounts | 0 | 0 | 0
Deductions | 16,886 | 16,023 | 19,017
Balance at end of period | $ 1,131 | $ 930 | $ 1,476

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