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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of goods and services sold | $ (994,810) | $ (1,018,359) | $ (947,820)
Interest expense | (40,962) | (37,427) | (26,371)
(Loss) income before income taxes | (38,083) | 97,993 | 96,287
Income tax (provision) benefit | (806) | 9,118 | (22,354)
Net (loss) income | (38,889) | 107,111 | 73,933
Prior service (cost) credit | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of goods and services sold | 381 | 333 | 376
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of goods and services sold | (4,245) | (7,018) | (10,034)
Postretirement Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
(Loss) income before income taxes | (3,864) | (6,685) | (9,658)
Income tax (provision) benefit | 947 | 1,638 | 3,767
Net (loss) income | (2,917) | (5,047) | (5,891)
Derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | 3,181 | 1,380 | 1,752
(Loss) income before income taxes | 3,181 | 1,380 | 1,752
Income tax (provision) benefit | (779) | (338) | (683)
Net (loss) income | $ 2,402 | $ 1,042 | $ 1,069

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