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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
Activity in valuation and qualifying accounts |  |  |
Balance at beginning of period | $ 300 |  |
Balance at end of period | 200 | $ 300 |
Deferred tax valuation allowance (deducted from net deferred tax assets) |  |  |
Activity in valuation and qualifying accounts |  |  |
Balance at beginning of period | 41,788 | 41,909 | $ 39,337
Charged (credited) to expense | (27,975) | (121) | 2,572
Reductions | 0 | 0 | 0
Balance at end of period | 13,813 | 41,788 | 41,909
Allowance for doubtful accounts (deducted from accounts receivable) |  |  |
Activity in valuation and qualifying accounts |  |  |
Balance at beginning of period | 389 | 291 | 337
Charged (credited) to expense | 297 | 200 | 178
Reductions | (196) | (102) | (224)
Balance at end of period | 490 | 389 | 291
Provision for inventory allowance (deducted from inventory) |  |  |
Activity in valuation and qualifying accounts |  |  |
Balance at beginning of period | 300 | 331 | 503
Charged (credited) to expense | 174 | 328 | 331
Reductions | (300) | (359) | (503)
Balance at end of period | $ 174 | $ 300 | $ 331

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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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- Definition Amount of decrease in 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 D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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