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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

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