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Capitalization (Tables)
 6 Months Ended
Mar. 31, 2024
Capitalization, Long-Term Debt and Equity [Abstract]  
Summary of Changes in Common Stock Equity
Summary of Changes in Common Stock Equity
 Common StockPaid In
Capital		Earnings
Reinvested
in the
Business		Accumulated
Other
Comprehensive
Income (Loss)
SharesAmount
 (Thousands, except per share amounts)
Balance at January 1, 202492,116 $92,116 $1,041,226 $1,973,279 $67,381 
Net Income Available for Common Stock166,272 
Dividends Declared on Common Stock ($0.495 Per Share)
(45,563)
Other Comprehensive Income, Net of Tax7,959 
Share-Based Payment Expense (1)
5,222 
Common Stock Issued Under Stock and Benefit Plans12 12 569 
Share Repurchases Under Repurchase Plan(96)(96)(1,088)(3,816)
Balance at March 31, 202492,032 $92,032 $1,045,929 $2,090,172 $75,340 
Balance at October 1, 202391,819 $91,819 $1,040,761 $1,885,856 $(55,060)
Net Income Available for Common Stock299,292 
Dividends Declared on Common Stock ($0.99 Per Share)
(91,160)
Other Comprehensive Income, Net of Tax130,400 
Share-Based Payment Expense (1)
9,356 
Common Stock Issued (Repurchased) Under Stock and Benefit Plans309 309 (3,100)
Share Repurchases Under Repurchase Plan(96)(96)(1,088)(3,816)
Balance at March 31, 202492,032 $92,032 $1,045,929 $2,090,172 $75,340 
Balance at January 1, 202391,787 $91,787 $1,025,639 $1,713,176 $(293,746)
Net Income Available for Common Stock140,880 
Dividends Declared on Common Stock ($0.475 Per Share)
(43,602)
Other Comprehensive Income, Net of Tax238,882 
Share-Based Payment Expense (1)
5,200 
Common Stock Issued Under Stock and Benefit Plans8 8 502 
Balance at March 31, 202391,795 $91,795 $1,031,341 $1,810,454 $(54,864)
Balance at October 1, 202291,478 $91,478 $1,027,066 $1,587,085 $(625,733)
Net Income Available for Common Stock310,570 
Dividends Declared on Common Stock ($0.95 Per Share)
(87,201)
Other Comprehensive Income, Net of Tax570,869 
Share-Based Payment Expense (1)
10,318 
Common Stock Issued (Repurchased) Under Stock and Benefit Plans
317 317 (6,043)
Balance at March 31, 202391,795 $91,795 $1,031,341 $1,810,454 $(54,864)

(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.