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Summary Of Significant Accounting Policies (Reclassification Out Of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Reclassification Adjustments out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Operating Revenues $ 729,950 $ 629,939 $ 1,279,432 $ 1,155,301
Total Before Income Tax 287,727 221,604 343,895 397,711
Income Tax Expense (71,369) (55,332) (82,551) (98,419)
Net Income Available for Common Stock 216,358 166,272 261,344 299,292
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss)        
Reclassification Adjustments out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total Before Income Tax (8,160) 60,148 21,344 79,857
Income Tax Expense 2,196 (16,689) (5,744) (22,158)
Net Income Available for Common Stock (5,964) 43,459 15,600 57,699
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) | Commodity Contracts | Gains and Losses on Derivative Financial Instruments        
Reclassification Adjustments out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Operating Revenues (7,834) 60,184 21,894 79,939
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) | Foreign Currency Contracts | Gains and Losses on Derivative Financial Instruments        
Reclassification Adjustments out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Operating Revenues $ (326) $ (36) $ (550) $ (82)