v3.26.1
Capitalization (Long-Term Debt Issuances) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 10, 2026
Jun. 30, 2026
Jun. 30, 2025
Debt Instrument [Line Items]      
Net Proceeds from Issuance of Long-Term Debt   $ 1,481,195 $ 988,731
4.75% Notes Due May 15, 2029      
Debt Instrument [Line Items]      
Debt instrument, term 3 years    
Amount of Issuance (in millions) $ 500,000    
Coupon Rate 4.75%    
Net Proceeds from Issuance of Long-Term Debt   495,600  
5.05% Notes Due October 15, 2031      
Debt Instrument [Line Items]      
Debt instrument, term 5 years    
Amount of Issuance (in millions) $ 500,000    
Coupon Rate 5.05%    
Net Proceeds from Issuance of Long-Term Debt   494,200  
5.50% Notes Due May 15, 2036      
Debt Instrument [Line Items]      
Debt instrument, term 10 years    
Amount of Issuance (in millions) $ 500,000    
Coupon Rate 5.50%    
Net Proceeds from Issuance of Long-Term Debt   $ 491,400