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Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2022 | Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Prior service credit | $ (300,854) |  |  | $ (291,122) |  |  | $ (928,255) | $ (828,424)
Other income (deductions), net | (448) |  |  | (2,442) |  |  | (31,599) | (6,760)
Income (loss) before income taxes | 3,915 |  |  | 1,041 |  |  | (21,182) | 9,153
Income taxes | (1,040) |  |  | 2,325 |  |  | 2,311 | (2,627)
Net income (loss) | 2,875 | $ (1,936) | $ (19,810) | 3,366 | $ 5,152 | $ (1,992) | (18,871) | 6,526
Post-retirement benefit plans |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Income taxes | (17) |  |  | 761 |  |  |  |
Net income (loss) | 52 |  |  | (2,358) |  |  | (23,313) | (6,737)
Post-retirement benefit plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Income (loss) before income taxes | 69 |  |  | (3,119) |  |  | (30,878) | (8,923)
Income taxes |  |  |  |  |  |  | 7,565 | 2,186
Prior service credit | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Prior service credit | 157 |  |  | 137 |  |  | 358 | 377
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Other income (deductions), net | (88) |  |  | (2,730) |  |  | (380) | (8,774)
Settlement loss | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Other income (deductions), net | 0 |  |  |  |  |  | (30,856) |
Prior service cost write-off | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Other income (deductions), net |  |  |  | (526) |  |  |  | (526)
Derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Income (loss) before income taxes | (470) |  |  | (790) |  |  | (2,006) | (2,444)
Income taxes | 117 |  |  | 194 |  |  | 493 | 599
Net income (loss) | (353) |  |  | (596) |  |  | (1,513) | (1,845)
Derivatives | Interest rate swap contracts | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Interest expense | $ (470) |  |  | $ (790) |  |  | $ (2,006) | $ (2,444)

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