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Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Derivatives |  |  |  |  |  |
Interest expense | $ 9,613 |  | $ 10,259 |  | $ 18,853 | $ 20,560
Income before income tax | (97,661) |  | 15,029 |  | (113,364) | 18,618
Income taxes | 11,066 |  | 165 |  | 16,463 | (440)
Net (loss) income | (86,595) | $ (10,306) | 15,194 | $ 2,984 | (96,901) | 18,178
Prior service credit |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income before income tax | 70 |  | 95 |  | 140 | 190
Actuarial losses |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income before income tax | (2,386) |  | (1,085) |  | (4,773) | (2,131)
Post-retirement benefit plans |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income before income tax | (2,316) |  | (990) |  | (4,633) | (1,941)
Net income | (1,827) |  | (734) |  | (3,554) | (1,463)
Derivatives |  |  |  |  |  |
Income taxes | (489) |  | (256) |  | (1,079) | (478)
Derivatives |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net income | 137 |  | 664 |  | 412 | 1,219
Derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Derivatives |  |  |  |  |  |
Income before income tax | 182 |  | 880 |  | 546 | 1,615
Income taxes | (45) |  | (216) |  | (134) | (396)
Net (loss) income | 137 |  | 664 |  | 412 | 1,219
Derivatives | Interest rate swap contracts | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Derivatives |  |  |  |  |  |
Interest expense | $ 182 |  | $ 880 |  | $ 546 | $ 1,615

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