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Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2026 | Mar. 31, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Prior service credit | $ (156,635) |  | $ (283,517) |  | $ (341,725) | $ (559,667)
Other income (deductions), net | 1,509 |  | (1,727) |  | 3,036 | 2,451
Income before income tax | (28,051) |  | (11,644) |  | 56,367 | (17,474)
Income taxes | 6,217 |  | 2,728 |  | (34,572) | 5,086
Net (loss) income | (21,834) | $ 43,629 | (8,916) | $ (3,472) | 21,795 | (12,388)
Gain (loss) on divestitures, net | (3,945) |  | (2,072) |  | 109,264 | (2,072)
Reclassification out of Accumulated Other Comprehensive Income | Net investment hedges |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Interest expense | (586) |  | 301 |  | (465) | 656
Post-retirement benefit plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income before income tax | 217 |  | 226 |  | 506 | 454
Income taxes | (54) |  | (57) |  | (127) | (114)
Net (loss) income | 163 |  | 169 |  | 379 | 340
Prior service credit | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Prior service credit | 58 |  | 89 |  | 115 | 180
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Other income (deductions), net | 159 |  | 137 |  | 391 | 274
Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income before income tax | (610) |  | 553 |  | (289) | 1,376
Income taxes | 154 |  | (137) |  | 73 | (342)
Net (loss) income | (456) |  | 416 |  | (216) | 1,034
Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Interest expense | (24) |  | 252 |  | $ 176 | 720
Other | Reclassification out of Accumulated Other Comprehensive Income | Divestitures |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Gain (loss) on divestitures, net | $ 0 |  |  |  |  | (17,674)
Other | Reclassification out of Accumulated Other Comprehensive Income | Divestitures |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Other current liabilities |  |  | $ 0 |  |  | $ (6,844)

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