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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |
Federal statutory tax rate | 21.00% | 21.00% | 24.50%
Income tax expense (benefit) | $ (18,685) | $ 806 | $ (9,118)
Foreign subsidiaries income (loss) before income taxes | (68,343) | 11,042 | $ 56,424
Undistributed earnings of foreign subsidiaries | 383,423 |  |
Valuation allowances | (22,527) | (15,352) |
Unrecognized tax benefits | 7,066 |  |
Change in unrecognized tax benefits | 7,803 |  |
Total penalties and interest accrued | 2,172 | $ 2,880 |
Capital Loss Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amount of tax credit carryforward | 20,119 |  |
Foreign Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amount of operating loss carryforwards | 101,994 |  |
Domestic Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amount of operating loss carryforwards | $ 2,189 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: 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.3) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 + Details
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