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Summary of Significant Accounting Policies - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Operating Revenues |  | $ 1,944,810 | $ 2,173,771 | $ 2,186,046
Total Before Income Tax |  | 87,255 | 641,399 | 682,650
Income Tax Expense |  | (9,742) | (164,533) | (116,629)
Net of Tax |  | 77,513 | 476,866 | $ 566,021
Amount of Gain or (Loss) Reclassified From Accumulated Other Comprehensive Income (Loss) |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total Before Income Tax |  | 214,148 | (90,330) |
Income Tax Expense |  | (61,550) | 6,217 |
Net of Tax |  | 152,598 | (84,113) |
Amount of Gain or (Loss) Reclassified From Accumulated Other Comprehensive Income (Loss) | Amortization of Prior Year Funded Status of the Pension and Other Post-Retirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Prior Service Cost | [1] | (56) | (82) |
Net Actuarial Loss | [1] | (2,451) | (1,592) |
Commodity Contracts | Amount of Gain or (Loss) Reclassified From Accumulated Other Comprehensive Income (Loss) | Gains (Losses) on Derivative Financial Instruments |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Operating Revenues |  | 217,012 | (88,015) |
Foreign Currency Contracts | Amount of Gain or (Loss) Reclassified From Accumulated Other Comprehensive Income (Loss) | Gains (Losses) on Derivative Financial Instruments |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Operating Revenues |  | $ (357) | $ (641) |
[1] | These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. Refer to Note K — Retirement Plan and Other Post-Retirement Benefits for additional details.

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