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ACCUMULATED OTHER COMPREHENSIVE INCOME - Components of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income | $ 718,106 | $ 868,351
Fair value of derivatives, tax | 131 | 2,771
Pension liability, tax | 23,195 | 12,076
Cumulative foreign currency translation |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income | (156,214) | (134,960)
Fair value of derivatives, net of tax of $131 and $2,771, respectively |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income | (404) | 8,538
Minimum pension liabilities, net of tax of $23,195 and $12,076, respectively |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income | (71,743) | (37,876)
Accumulated Other Comprehensive (Loss) Income (net of tax) |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income | $ (228,361) | $ (164,298)

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