v3.25.2
Summary Of Significant Accounting Policies (Components Of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Other Comprehensive Gains and Losses Before Reclassifications $ 108,818 $ (15,850) $ (83,082) $ 172,249
Amounts Reclassified From Other Comprehensive Income (Loss) (1,650) (54,440) (17,249) (112,139)
Gains and Losses on Derivative Financial Instruments        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (151,700) 135,023 55,799 4,623
Other Comprehensive Gains and Losses Before Reclassifications 108,818 (15,850) (83,082) 172,249
Amounts Reclassified From Other Comprehensive Income (Loss) (1,650) (54,440) (17,249) (112,139)
Ending balance (44,532) 64,733 (44,532) 64,733
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 (222,975) 75,340 (15,476) (55,060)
Ending balance $ (115,807) $ 5,050 $ (115,807) $ 5,050