Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details)

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Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2024
Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Prior service credit $ (295,996)     $ (333,603)     $ (936,670) $ (973,870)
Other income (deductions), net (974)     (2,487)     (2,732) (3,038)
(Loss) income before income taxes (7,052)     8,113     (2,176) 25,579
Income taxes 8,829     558     10,677 (4,136)
Net income 1,777 $ 9,027 $ (2,303) 8,671 $ 9,125 $ 3,647 8,501 21,443
Reclassification out of Accumulated Other Comprehensive Income | Net investment hedges                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Interest income (expense) 306     284     891 866
Post-retirement benefit plans | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
(Loss) income before income taxes 284     274     847 (445)
Income taxes (72)     (69)     (214) 112
Net income 212     205     633 (333)
Prior service credit | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Prior service credit 91     92     273 274
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Other income (deductions), net 193     182     574 552
Settlement loss | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Other income (deductions), net       0       (1,271)
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 984     601     2,896 2,880
Income taxes (246)     (151)     (724) (728)
Net income 738     450     2,172 2,152
Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Interest income (expense) $ 678     $ 317     $ 2,005 $ 2,014