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Capitalization (Tables)
 3 Months Ended
Dec. 31, 2019
Capitalization, Long-term Debt and Equity [Abstract]  
Summary of Changes in Common Stock Equity

Summary of Changes in Common Stock Equity
 
Common Stock
 
Paid In
Capital
 
Earnings
Reinvested
in the
Business
 
Accumulated
Other
Comprehensive
Income (Loss)
Shares
 
Amount
 
 
(Thousands, except per share amounts)
Balance at October 1, 2019
86,315

 
$
86,315

 
$
832,264

 
$
1,272,601

 
$
(52,155
)
Net Income Available for Common Stock
 
 
 
 
 
 
86,591

 
 
Dividends Declared on Common Stock ($0.435 Per Share)
 
 
 
 
 
 
(37,650
)
 
 
Cumulative Effect of Adoption of Authoritative Guidance for Hedging
 
 
 
 
 
 
(950
)
 
 
Other Comprehensive Loss, Net of Tax
 
 
 
 
 
 
 
 
(3,995
)
Share-Based Payment Expense (1)
 
 
 
 
2,828

 
 
 
 
Common Stock Issued (Repurchased) Under Stock and Benefit Plans
237

 
237

 
(3,946
)
 
 
 
 
Balance at December 31, 2019
86,552

 
$
86,552

 
$
831,146

 
$
1,320,592

 
$
(56,150
)
 
 
 
 
 
 
 
 
 
 
Balance at October 1, 2018
85,957

 
$
85,957

 
$
820,223

 
$
1,098,900

 
$
(67,750
)
Net Income Available for Common Stock
 
 
 
 
 
 
102,660

 
 
Dividends Declared on Common Stock ($0.425 Per Share)
 
 
 
 
 
 
(36,663
)
 
 
Cumulative Effect of Adoption of Authoritative Guidance for Financial Assets and Liabilities
 
 
 
 
 
 
7,437

 
 
Other Comprehensive Income, Net of Tax
 
 
 
 
 
 
 
 
39,060

Share-Based Payment Expense (1)
 
 
 
 
4,917

 
 
 
 
Common Stock Issued (Repurchased) Under Stock and Benefit Plans
314

 
314

 
(8,064
)
 
 
 
 
Balance at December 31, 2018
86,271

 
$
86,271

 
$
817,076

 
$
1,172,334

 
$
(28,690
)


(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.