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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Valuation allowance - deferred tax assets |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 4,372 | $ 3,810 | $ 3,291
Charged to costs and expenses | (2,186) | 670 | 529
Charged to Other Accounts | 0 | 0 | 0
Deductions | 0 | 108 | 10
Balance at end of period | 2,186 | 4,372 | 3,810
Reserve for future credit returns and pricing adjustments |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 1,476 | 2,677 | 2,560
Charged to costs and expenses | 15,477 | 17,816 | 12,640
Charged to Other Accounts | 0 | 0 | 0
Deductions | 16,023 | 19,017 | 12,523
Balance at end of period | $ 930 | $ 1,476 | $ 2,677

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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