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 6 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Prior service credit $ (323,041)   $ (329,957)   $ (640,674) $ (640,267)
Other income (deductions), net (878)   1,503   (1,758) (551)
Income before income taxes 7,905   12,507   4,876 17,466
Income taxes 1,122   (3,382)   1,848 (4,694)
Net income 9,027 $ (2,303) 9,125 $ 3,647 6,724 12,772
Reclassification out of Accumulated Other Comprehensive Income | Net investment hedges            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Interest income (expense) 327   309   586 581
Post-retirement benefit plans | Reclassification out of Accumulated Other Comprehensive Income            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Income before income taxes 281   274   563 (719)
Income taxes (71)   (69)   (142) 182
Net income 210   205   421 (537)
Prior service credit | Reclassification out of Accumulated Other Comprehensive Income            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Prior service credit 91   91   182 182
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Other income (deductions), net 190   183   381 370
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]            
Income before income taxes 995   1,341   1,913 2,278
Income taxes (249)   (339)   (479) (576)
Net income 746   1,002   1,434 1,702
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) $ 668   $ 1,032   $ 1,327 $ 1,697