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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Operating Loss Carryforwards [Line Items] |  |  |
Income tax expense (benefit) | $ (9,997) | $ 1,774 | $ (4,391)
Foreign subsidiaries income (loss) before income taxes | 39,069 | 43,090 | $ 47,653
Undistributed earnings of foreign subsidiaries | 411,885 |  |
Valuation allowances | 45,462 | 22,506 |
Unrecognized tax benefits | 4,506 |  |
Change in unrecognized tax benefits | 2,815 |  |
Total penalties and interest accrued | 588 | $ 730 |
Foreign Tax Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amount of operating loss carryforwards | 394,576 |  |
Domestic Tax Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amount of operating loss carryforwards | $ 2,710 |  |

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