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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, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Foreign currency translation adjustments, Pre-tax | $ 9,403 | $ 10,667 | $ 17,284
Pension and other defined benefit plans, Pre-tax | 24,081 | 14,160 | (8,694)
Cash flow hedge, Pre-tax | 900 | 1,370 | (2,593)
Total other comprehensive income (loss), Pre-tax | 34,384 | 26,197 | 5,997
Foreign currency translation adjustments, Tax | 0 | 0 | 0
Pension and other defined benefit plans, Tax | (7,700) | (4,957) | 3,043
Cash flow hedge, Tax | (315) | (480) | 907
Total other comprehensive income (loss), Tax | (8,015) | (5,437) | 3,950
Foreign currency translation adjustments, Net of Tax | 9,403 | 10,667 | 17,284
Pension and other defined benefit plans, Net of Tax | 16,381 | 9,203 | (5,651)
Cash flow hedge, Net of Tax | 585 | 890 | (1,686)
Total other comprehensive income, net of taxes | $ 26,369 | $ 20,760 | $ 9,947

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