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OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Summary of Other Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Foreign currency translation adjustments, Pre-tax | $ (8,460) | $ 9,403 | $ 10,667
Pension and other defined benefit plans, Pre-tax | (30,581) | 24,081 | 14,160
Cash flow hedge, Pre-tax | (413) | 900 | 1,370
Total other comprehensive income (loss), Pre-tax | (39,454) | 34,384 | 26,197
Foreign currency translation adjustments, Tax | 0 | 0 | 0
Pension and other defined benefit plans, Tax | 7,526 | (7,700) | (4,957)
Cash flow hedge, Tax | 124 | (315) | (480)
Total other comprehensive income (loss), Tax | 7,650 | (8,015) | (5,437)
Foreign currency translation adjustments, Net of Tax | (8,460) | 9,403 | 10,667
Pension and other defined benefit plans, Net of Tax | (23,055) | 16,381 | 9,203
Cash flow hedge, Net of Tax | (289) | 585 | 890
Total other comprehensive income (loss), net of taxes | $ (31,804) | $ 26,369 | $ 20,760

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