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COMMON STOCK EQUITY (Tables)
 9 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Changes in Common Stock Equity
Changes in common stock equity during the nine months ended June 30, 2018, were as follows:
(Thousands)
Number of Shares
Common Stock
Premium on Common Stock
Accumulated Other Comprehensive Loss
Treasury Stock And Other
Retained Earnings
Total
Balance at September 30, 2017
86,556

$
222,258

$
219,696

 
$
(3,256
)
 
$
(70,039
)
$
867,984

$
1,236,643

Net income



 

 

249,691

249,691

Other comprehensive loss



 
(12,624
)
 


(12,624
)
Common stock issued:
 
 
 
 
 
 
 
 
 
Incentive plan
558

1,396

15,141

 

 



16,537

Dividend reinvestment plan (1)
334


173

 

 
13,224


13,397

Waiver discount
1,014

2,535

39,142

 

 


41,677

Cash dividend ($.8175 per share)



 

 

(71,755
)
(71,755
)
Treasury stock and other
(250
)

(14
)
 

 
(23,590
)

(23,604
)
Balance at June 30, 2018
88,212

$
226,189

$
274,138

 
$
(15,880
)
 
$
(80,405
)
$
1,045,920

$
1,449,962


(1)
Shares sold through the DRP are issued from treasury stock at average cost, which may differ from the actual market price paid.
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table presents the changes in the components of accumulated other comprehensive (loss) income, net of related tax effects during the three months ended June 30, 2018 and 2017:
(Thousands)
Available for Sale Securities
Postemployment Benefit Obligation
Total
Balance at March 31, 2018
$
—

 
$
(13,788
)
 
$
(13,788
)
Other comprehensive (loss) income, net of tax
 
 
 
 
 
Other comprehensive (loss),before reclassifications, net of tax of $854, $0, $854
(2,364
)
 
—

 
(2,364
)
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(104), $(104)
—

 
272

(1) 
272

Net current-period other comprehensive (loss) income, net of tax of $854, $(104), $750
(2,364
)
 
272

 
(2,092
)
Balance at June 30, 2018
$
(2,364
)
 
$
(13,516
)
 
$
(15,880
)
Balance at March 31, 2017
$
11,121

 
$
(18,718
)
 
$
(7,597
)
Other comprehensive income, net of tax
 
 
 
 
 
Other comprehensive (loss),before reclassifications, net of tax of $2,375, $0, $2,375
(3,622
)
 
—

 
(3,622
)
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(217), $(217)
—

 
318

(1) 
318

Net current-period other comprehensive (loss) income, net of tax of $2,375, $(217), $2,158
(3,622
)
 
318

 
(3,304
)
Balance as of June 30, 2017
$
7,499

 
$
(18,400
)
 
$
(10,901
)

The following table presents the changes in the components of accumulated other comprehensive income (loss), net of related tax effects during the nine months ended June 30, 2018 and 2017:
(Thousands)
Available for Sale Securities
Postemployment Benefit Obligation
Total
Balance at September 30, 2017
$
11,044

 
$
(14,300
)
 
$
(3,256
)
Other comprehensive (loss) income, net of tax
 
 
 
 
 
Other comprehensive (loss),before reclassifications, net of tax of $9,071, $0, $9,071
(25,055
)
 
—

 
(25,055
)
Amounts reclassified from accumulated other comprehensive income, net of tax of $(858), $(344), $(1,202)
11,647

 
784

(1) 
12,431

Net current-period other comprehensive (loss) income, net of tax of $8,213, $(344), $7,869
(13,408
)
 
784

 
(12,624
)
Balance at June 30, 2018
$
(2,364
)
 
$
(13,516
)
 
$
(15,880
)
Balance as of September 30, 2016
$
4,198

 
$
(19,353
)
 
$
(15,155
)
Other comprehensive income (loss), net of tax
 
 
 
 
 
Other comprehensive income, before reclassifications, net of tax of $(4,273), $0, $(4,273)
6,474

 
—

 
6,474

Amounts reclassified from accumulated other comprehensive (loss) income, net of tax of $2,192, $(651), $1,541
(3,173
)
 
953

(1) 
(2,220
)
Net current-period other comprehensive income, net of tax of $(2,081), $(651), $(2,732)
3,301

 
953

 
4,254

Balance as of June 30, 2017
$
7,499

 
$
(18,400
)
 
$
(10,901
)
(1)
Included in the computation of net periodic pension cost, a component of operations and maintenance expense on the Unaudited Condensed Consolidated Statements of Operations.