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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Operating Loss Carryforwards [Line Items] |  |  |
Income tax expense (benefit) | $ 40,680 | $ (9,997) | $ 1,774
Foreign subsidiaries income (loss) before income taxes | 30,212 | 39,069 | $ 43,090
Undistributed earnings of foreign subsidiaries | 166,683 |  |
Valuation allowances | 66,632 | 45,462 |
Unrecognized tax benefits | 2,972 |  |
Change in unrecognized tax benefits | 366 |  |
Total penalties and interest accrued | 241 | $ 588 |
Foreign Tax Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amount of operating loss carryforwards | 433,770 |  |
Domestic Tax Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amount of operating loss carryforwards | $ 3,977 |  |

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