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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of goods and services sold | $ (1,129,198) | $ (1,000,537) | $ (994,810)
Other income (deductions), net | (6,762) | (9,221) | (8,918)
Income (loss) before income taxes | 9,233 |  |
Income tax (provision) benefit | (6,375) | 18,685 | (806)
Net income (loss) | 2,858 | (87,652) | (38,889)
Interest expense | (28,684) | (34,885) | (40,962)
Postretirement Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income (loss) before income taxes | (9,539) | (9,117) | (3,864)
Income tax (provision) benefit | 2,337 | 2,234 | 947
Net income (loss) | (7,202) | (6,883) | (2,917)
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 | 491 | 650 | 381
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other income (deductions), net | (9,769) | (9,767) | (4,245)
Prior service cost write-off | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other income (deductions), net | (261) | 0 | 0
Derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income (loss) before income taxes | (3,249) | (861) | 3,181
Income tax (provision) benefit | 796 | 211 | (779)
Net income (loss) | (2,453) | (650) | 2,402
Interest expense | $ (3,249) | $ (861) | $ 3,181

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