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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

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