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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Blended tax rate |  |  |  | 24.50% |
Effective tax rate |  | 18.00% | 20.00% | 7.00% |
Retroactive tax benefit | $ 1,700 |  |  |  |
Valuation allowance related to deferred tax assets |  | $ 9,027 | $ 8,231 |  | $ 500
Tax expense |  |  |  | $ 500 |
Undistributed earnings of foreign subsidiaries |  | 16,100 |  |  |
Tax credit carryforwards |  | 100 |  |  |
Change in valuation allowance |  | 800 |  |  |
Unrecognized tax benefits, if recognized, would impact the effective tax rate |  | 800 | $ 2,100 | $ 1,300 |
Decrease in unrecognized tax benefits is reasonably possible |  | 100 |  |  |
International |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards |  | 800 |  |  |
Operating loss carryforwards, subject to expiration |  | $ 200 |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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