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Capitalization (Tables)
9 Months Ended
Jun. 30, 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 April 1, 2019
86,301

 
$
86,301

 
$
821,837

 
$
1,236,657

 
$
(54,286
)
Net Income Available for Common Stock
 
 
 
 
 
 
63,753

 
 
Dividends Declared on Common Stock ($0.435 Per Share)
 
 
 
 
 
 
(37,543
)
 
 
Other Comprehensive Income, Net of Tax
 
 
 
 
 
 
 
 
21,620

Share-Based Payment Expense (1)
 
 
 
 
5,054

 
 
 
 
Common Stock Issued Under Stock and Benefit Plans
6

 
6

 
352

 
 
 
 
Balance at June 30, 2019
86,307

 
$
86,307

 
$
827,243

 
$
1,262,867

 
$
(32,666
)
 
 
 
 
 
 
 
 
 
 
Balance at October 1, 2018
85,957

 
$
85,957

 
$
820,223

 
$
1,098,900

 
$
(67,750
)
Net Income Available for Common Stock
 
 
 
 
 
 
257,009

 
 
Dividends Declared on Common Stock ($1.285 Per Share)
 
 
 
 
 
 
(110,885
)
 
 
Cumulative Effect of Adoption of Authoritative Guidance for Financial Assets and Liabilities
 
 
 
 
 
 
7,437

 
 
Cumulative Effect of Adoption of Authoritative Guidance for Reclassification of Stranded Tax Effects
 
 
 
 
 
 
10,406

 
 
Other Comprehensive Income, Net of Tax
 
 
 
 
 
 
 
 
35,084

Share-Based Payment Expense (1)
 
 
 
 
15,008

 
 
 
 
Common Stock Issued (Repurchased) Under Stock and Benefit Plans
350

 
350

 
(7,988
)
 
 
 
 
Balance at June 30, 2019
86,307

 
$
86,307

 
$
827,243

 
$
1,262,867

 
$
(32,666
)
 
 
 
 
 
 
 
 
 
 
Balance at April 1, 2018
85,882

 
$
85,882

 
$
810,126

 
$
1,070,939

 
$
(47,760
)
Net Income Available for Common Stock
 
 
 
 
 
 
63,025

 
 
Dividends Declared on Common Stock ($0.425 Per Share)
 
 
 
 
 
 
(36,526
)
 
 
Other Comprehensive Loss, Net of Tax
 
 
 
 
 
 
 
 
(24,636
)
Share-Based Payment Expense (1)
 
 
 
 
3,558

 
 
 
 
Common Stock Issued Under Stock and Benefit Plans
62

 
62

 
2,711

 
 
 
 
Balance at June 30, 2018
85,944

 
$
85,944

 
$
816,395

 
$
1,097,438

 
$
(72,396
)
 
 
 
 
 
 
 
 
 
 
Balance at October 1, 2017
85,543

 
$
85,543

 
$
796,646

 
$
851,669

 
$
(30,123
)
Net Income Available for Common Stock
 
 
 
 
 
 
353,527

 
 
Dividends Declared on Common Stock ($1.255 Per Share)
 
 
 
 
 
 
(107,758
)
 
 
Other Comprehensive Loss, Net of Tax
 
 
 
 
 
 
 
 
(42,273
)
Share-Based Payment Expense (1)
 
 
 
 
10,632

 
 
 
 
Common Stock Issued Under Stock and Benefit Plans
401

 
401

 
9,117

 
 
 
 
Balance at June 30, 2018
85,944

 
$
85,944

 
$
816,395

 
$
1,097,438

 
$
(72,396
)


(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.