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OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | $ 73,972 | $ 224,888 | $ 315,244 | $ 477,570
AOCI attributable to parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | (71,920) | (58,024) | $ (70,010) | $ (82,738)
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | (45,155) | (38,586) |  |
Pension amortization |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | (27,488) | (19,127) |  |
Cash flow hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | $ 723 | $ (311) |  |

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