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Capitalization and Short-Term Borrowings (Summary of Changes in Common Stock Equity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (in shares)     91,005,993  
Beginning balance     $ 2,848,343  
Net Income Available for Common Stock $ 216,358 $ 166,272 261,344 $ 299,292
Dividends Declared on Common Stock (46,555) (45,563) (93,226) (91,160)
Other Comprehensive Income (Loss), Net of Tax $ (146,822) $ 7,959 $ (207,499) $ 130,400
Share Repurchases (in shares)     (608,295)  
Ending balance (in shares) 90,397,698   90,397,698  
Ending balance $ 2,765,611   $ 2,765,611  
Dividends per share (in dollars per share) $ 0.515 $ 0.495 $ 1.030 $ 0.990
Share Repurchase Plan        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share Repurchases (in shares)     (774,768)  
Share Repurchases     $ (49,800)  
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (in shares) 90,613,000 92,116,000 91,006,000 91,819,000
Beginning balance $ 90,613 $ 92,116 $ 91,006 $ 91,819
Common stock issued under stock and benefit plans (in shares) 11,000 12,000 167,000 309,000
Common Stock Issued Under Stock and Benefit Plans $ 11 $ 12 $ 167 $ 309
Ending balance (in shares) 90,398,000 92,032,000 90,398,000 92,032,000
Ending balance $ 90,398 $ 92,032 $ 90,398 $ 92,032
Common Stock | Share Repurchase Plan        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share Repurchases (in shares) (226,000) (96,000) (775,000) (96,000)
Share Repurchases $ (226) $ (96) $ (775) $ (96)
Paid In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 1,039,705 1,041,226 1,045,487 1,040,761
Share-Based Payment Expense [1] 5,135 5,222 9,225 9,356
Common Stock Issued Under Stock and Benefit Plans 604 569    
Ending balance 1,042,822 1,045,929 1,042,822 1,045,929
Paid In Capital | Stock and Benefit Plans        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share Repurchases     (2,906) (3,100)
Paid In Capital | Share Repurchase Plan        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share Repurchases (2,622) (1,088) (8,984) (1,088)
Earnings Reinvested in the Business        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 1,698,648 1,973,279 1,727,326 1,885,856
Net Income Available for Common Stock 216,358 166,272 261,344 299,292
Dividends Declared on Common Stock (46,555) (45,563) (93,226) (91,160)
Share Repurchases (13,085) (3,816) (40,078) (3,816)
Ending balance 1,855,366 2,090,172 1,855,366 2,090,172
Earnings Reinvested in the Business | Share Repurchase Plan        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share Repurchases (13,085) (3,816) (40,078) (3,816)
Accumulated Other Comprehensive Income (Loss)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (76,153) 67,381 (15,476) (55,060)
Other Comprehensive Income (Loss), Net of Tax (146,822) 7,959 (207,499) 130,400
Ending balance $ (222,975) $ 75,340 $ (222,975) $ 75,340
[1] Paid in Capital includes compensation costs associated with performance shares and/or restricted stock awards. The expense is included within Net Income Available For Common Stock, net of tax benefits.