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OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | $ (15,676) | $ 12,528 | $ 13,502
Tax | 1,780 | (542) | (774)
Net of tax | (13,896) | 11,986 | 12,728
Foreign currency translation adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | (6,569) | 10,137 | 8,447
Tax | 0 | 0 | 0
Net of tax | (6,569) | 10,137 | 8,447
Pension and other defined benefit plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | (10,584) | 1,947 | 8,418
Tax | 2,223 | (409) | (1,784)
Net of tax | (8,361) | 1,538 | 6,634
Cash flow hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-tax | 1,477 | 444 | (3,363)
Tax | (443) | (133) | 1,010
Net of tax | $ 1,034 | $ 311 | $ (2,353)

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