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Summary Of Significant Accounting Policies (Components 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
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Other Comprehensive Gains and Losses Before Reclassifications $ (152,786) $ 51,418 $ (191,899) $ 188,099
Amounts Reclassified From Other Comprehensive Income (Loss) 5,964 (43,459) (15,600) (57,699)
Gains and Losses on Derivative Financial Instruments        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (4,878) 127,064 55,799 4,623
Other Comprehensive Gains and Losses Before Reclassifications (152,786) 51,418 (191,899) 188,099
Amounts Reclassified From Other Comprehensive Income (Loss) 5,964 (43,459) (15,600) (57,699)
Ending balance (151,700) 135,023 (151,700) 135,023
Funded Status of the Pension and Other Post-Retirement Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (71,275) (59,683) (71,275) (59,683)
Other Comprehensive Gains and Losses Before Reclassifications 0 0 0 0
Amounts Reclassified From Other Comprehensive Income (Loss) 0 0 0 0
Ending balance (71,275) (59,683) (71,275) (59,683)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (76,153) 67,381 (15,476) (55,060)
Ending balance $ (222,975) $ 75,340 $ (222,975) $ 75,340