Annual report pursuant to Section 13 and 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications out of AOCI (Details)

v3.24.3
ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Prior service (cost) credit $ (1,266,030) $ (1,303,224) $ (1,240,125)
Other income (deductions), net (6,800) (2,559) (32,557)
(Loss) income before income taxes (69,657) 40,910 (104,219)
Income tax benefit (provision) 9,997 (1,774) 4,391
Net (loss) income (59,660) 39,136 (99,828)
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 1,139 (135) (30,809)
Income tax benefit (provision) (289) 33 7,548
Net (loss) income 850 (102) (23,261)
Prior service (cost) credit | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Prior service (cost) credit 364 364 516
Actuarial gains (losses) | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other income (deductions), net 775 772 (469)
Settlement losses | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other income (deductions), net 0 (1,271) (30,856)
Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
(Loss) income before income taxes 3,495 3,785 (141)
Income tax benefit (provision) (884) (959) 36
Net (loss) income 2,611 2,826 (105)
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 2,679 2,626 (1,786)
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 $ 816 $ 1,159 $ 1,645