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Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2021 | Mar. 31, 2020
Derivatives |  |  |  |  |  |
Interest expense | $ 7,233 |  | $ 9,613 |  | $ 14,961 | $ 18,853
Income before income tax | 6,124 |  | (97,661) |  | 8,112 | (113,364)
Income taxes | (972) |  | 11,066 |  | (4,952) | 16,463
Net income (loss) | 5,152 | $ (1,992) | (86,595) | $ (10,306) | 3,160 | (96,901)
Prior service credit |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income before income tax | 132 |  | 70 |  | 240 | 140
Actuarial losses |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income before income tax | (3,023) |  | (2,386) |  | (6,044) | (4,773)
Post-retirement benefit plans |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income before income tax | (2,891) |  | (2,316) |  | (5,804) | (4,633)
Net income | (2,255) |  | (1,827) |  | (4,379) | (3,554)
Derivatives |  |  |  |  |  |
Income taxes | (636) |  | (489) |  | (1,425) | (1,079)
Derivatives |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net income | (567) |  | 137 |  | (1,249) | 412
Derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Derivatives |  |  |  |  |  |
Income before income tax | (751) |  | 182 |  | (1,654) | 546
Income taxes | 184 |  | (45) |  | 405 | (134)
Net income (loss) | (567) |  | 137 |  | (1,249) | 412
Derivatives | Interest rate swap contracts | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Derivatives |  |  |  |  |  |
Interest expense | $ (751) |  | $ 182 |  | $ (1,654) | $ 546

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