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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS - Schedule of valuation and qualifying accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Allowance for Doubtful Accounts |  |  |
Segment Reporting Information [Line Items] |  |  |
Balance at Beginning of Year | $ 8,178 | $ 7,588 | $ 6,115
Additions | 795 | 5,175 | 6,253
Reductions | (393) | (4,584) | (4,799)
Other | 207 | (1) | 19
Balance at End of Year | 8,787 | 8,178 | 7,588
Inventory valuation |  |  |
Segment Reporting Information [Line Items] |  |  |
Balance at Beginning of Year | 18,903 | 15,218 | 15,940
Additions | 24,400 | 6,771 | 1,947
Reductions | (12,099) | (3,412) | (2,614)
Other | 401 | 326 | (55)
Balance at End of Year | 31,605 | 18,903 | 15,218
Deferred tax valuation allowance |  |  |
Segment Reporting Information [Line Items] |  |  |
Balance at Beginning of Year | 9,824 | 10,823 | 8,520
Additions | 601 | 0 | 2,303
Reductions | 0 | (999) | 0
Other | 0 | 0 | 0
Balance at End of Year | $ 10,425 | $ 9,824 | $ 10,823

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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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