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Capitalization (Tables)
 9 Months Ended
Jun. 30, 2022
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 April 1, 202291,449 $91,449 $1,018,784 $1,407,683 $(654,254)
Net Income Available for Common Stock108,158 
Dividends Declared on Common Stock ($0.475 Per Share)(43,446)
Other Comprehensive Income, Net of Tax71,386 
Share-Based Payment Expense (1)
4,094 
Common Stock Issued Under Stock and Benefit Plans17 17 76 
Balance at June 30, 202291,466 $91,466 $1,022,954 $1,472,395 $(582,868)
Balance at October 1, 202191,182 $91,182 $1,017,446 $1,191,175 $(513,597)
Net Income Available for Common Stock407,879 
Dividends Declared on Common Stock ($1.385 Per Share)(126,659)
Other Comprehensive Loss, Net of Tax(69,271)
Share-Based Payment Expense (1)
13,826 
Common Stock Issued (Repurchased) Under Stock and Benefit Plans284 284 (8,318)
Balance at June 30, 202291,466 $91,466 $1,022,954 $1,472,395 $(582,868)
Balance at April 1, 202191,164 $91,164 $1,009,075 $1,100,718 $(101,988)
Net Income Available for Common Stock86,475 
Dividends Declared on Common Stock ($0.455 Per Share)(41,493)
Other Comprehensive Loss, Net of Tax(136,474)
Share-Based Payment Expense (1)
3,196 
Common Stock Issued Under Stock and Benefit Plans9 9 432 
Balance at June 30, 202191,173 $91,173 $1,012,703 $1,145,700 $(238,462)
Balance at October 1, 202090,955 $90,955 $1,004,158 $991,630 $(114,757)
Net Income Available for Common Stock276,685 
Dividends Declared on Common Stock ($1.345 Per Share)(122,615)
Other Comprehensive Loss, Net of Tax(123,705)
Share-Based Payment Expense (1)
10,975 
Common Stock Issued (Repurchased) Under Stock and Benefit Plans
218 218 (2,430)
Balance at June 30, 202191,173 $91,173 $1,012,703 $1,145,700 $(238,462)

(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.