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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of goods and services sold | $ (1,303,224) | $ (1,240,125) | $ (1,129,198)
Other income (deductions), net | (2,559) | (32,557) | (4,117)
Income (loss) before income taxes | 40,910 | (104,219) | 9,233
Income tax (provision) benefit | (1,774) | 4,391 | (6,375)
Net income (loss) | 39,136 | (99,828) | 2,858
Interest expense | (44,648) | (27,725) | (28,684)
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 | (135) | (30,809) | (9,539)
Income tax (provision) benefit | 33 | 7,548 | 2,337
Net income (loss) | (102) | (23,261) | (7,202)
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 | 364 | 516 | 491
Actuarial gains (losses) | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other income (deductions), net | 772 | (469) | (9,769)
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 | 0 | 0 | (261)
Settlement losses | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other income (deductions), net | (1,271) | (30,856) | 0
Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income (loss) before income taxes | 3,785 | (141) | (3,186)
Income tax (provision) benefit | (959) | 36 | 781
Net income (loss) | 2,826 | (105) | (2,405)
Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swaps |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | 2,626 | (1,786) | (3,249)
Net investment hedge | Reclassification out of Accumulated Other Comprehensive Income | Cross-Currency Swaps |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | $ 1,159 | $ 1,645 | $ 63

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