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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Currency translation adjustments |  | $ 123 | $ 112 | $ 96
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Year |  | 7,908 | 3,938 | 3,776
Additions: Charged to Costs and Expenses |  | 4,293 | 4,899 | 207
Additions: Charged to Other Accounts | [1] | 30 | 251 | 466
Deductions | [2] | (5,342) | (1,180) | (511)
Balance at End of Year |  | 6,889 | 7,908 | 3,938
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Year |  | 3,638 | 4,522 | 3,714
Additions: Charged to Costs and Expenses |  | 12 | 19 | 73
Additions: Charged to Other Accounts | [1] |  |  | 553
Deductions | [2] | (1,818) | (903) | 182
Balance at End of Year |  | $ 1,832 | $ 3,638 | $ 4,522
[1] | Includes recoveries of accounts previously written off.
[2] | Represents accounts receivable written off against the allowance for uncollectible accounts and releases of valuation reserves to income tax expense. Also included are foreign currency exchange rate adjustments. Currency translation adjustments resulted in a decrease in the reserves of $123 in fiscal year 2020, an increase in the reserves of $112 in fiscal year 2019, and an increase in the reserves of $96 in fiscal year 2018.

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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 increase in valuation and qualifying accounts and reserves from charge to cost and expense. + 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 C)(1)) -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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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. Also included are the total of recoveries of amounts due the Entity that had previously been written off as uncollectible using allowances (the valuation accounts that are netted against the cost of an asset to value it at its carrying value) and total of reestablishments of reserves (liabilities established to represent expected future costs) that had previously been utilized. + References No definition available. + Details
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- Definition Total increases or decreases related to foreign currency translation adjustments in allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References No definition available. + Details
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