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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Deferred tax valuation allowance (deducted from net deferred tax assets) |  |  |
Activity in valuation and qualifying accounts |  |  |
Balance at beginning of period | $ 39,337 | $ 54,379 | $ 44,257
Charged (credited) to expense | 2,572 | (15,042) | 10,122
Reductions | 0 | 0 | 0
Balance at end of period | 41,909 | 39,337 | 54,379
Allowance for doubtful accounts (deducted from accounts receivable) |  |  |
Activity in valuation and qualifying accounts |  |  |
Balance at beginning of period | 337 | 668 | 718
Charged (credited) to expense | 178 | 199 | 357
Reductions | (224) | (530) | (407)
Balance at end of period | 291 | 337 | 668
Provision for Inventory allowance (deducted from inventory) |  |  |
Activity in valuation and qualifying accounts |  |  |
Balance at beginning of period | 503 | 4,572 | 3,446
Charged (credited) to expense | 331 | 2,494 | 10,381
Reductions | (503) | (6,563) | (9,255)
Balance at end of period | $ 331 | $ 503 | $ 4,572

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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) -URI http://asc.fasb.org/extlink&oid=26873400&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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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