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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of goods and services sold | $ (1,000,537) | $ (994,810) | $ (1,018,359)
Interest expense | (34,885) | (40,962) | (37,427)
(Loss) income before income taxes | (106,337) | (38,083) | 97,993
Income tax benefit (provision) | 18,685 | (806) | 9,118
Net (loss) income | (87,652) | (38,889) | 107,111
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 | 650 | 381 | 333
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 | (9,767) | (4,245) | (7,018)
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 | (9,117) | (3,864) | (6,685)
Income tax benefit (provision) | 2,234 | 947 | 1,638
Net (loss) income | (6,883) | (2,917) | (5,047)
Derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | (861) | 3,181 | 1,380
(Loss) income before income taxes | (861) | 3,181 | 1,380
Income tax benefit (provision) | 211 | (779) | (338)
Net (loss) income | $ (650) | $ 2,402 | $ 1,042

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