v3.26.1
Summary of Significant Accounting Policies (Schedule of Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Reclassification Adjustments out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Operating Revenues $ 858,373 $ 729,950 $ 1,509,881 $ 1,279,432
Total Before Income Tax 330,403 287,727 571,385 343,895
Income Tax Expense [1] (82,735) (71,369) (142,072) (82,551)
Net Income Available for Common Stock 247,668 216,358 429,313 261,344
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 (48,760) (8,160) (35,485) 21,344
Income Tax Expense 13,055 2,196 9,501 (5,744)
Net Income Available for Common Stock (35,705) (5,964) (25,984) 15,600
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 (48,694) (7,834) (35,299) 21,894
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 $ (66) $ (326) $ (186) $ (550)
[1] The Company considers this line to be a significant expense.