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COMMON STOCK EQUITY (Tables)
 9 Months Ended
Jun. 30, 2016
Equity [Abstract]  
Changes in Common Stock Equity
Changes in common stock equity during the nine months ended June 30, 2016, were as follows:
(Thousands)
Number of Shares
Common Stock
Premium on Common Stock
Accumulated Other Comprehensive (Loss) Income
Treasury Stock And Other
Retained Earnings
Total
Balance at September 30, 2015
85,531

$
220,838

$
209,931

 
$
(9,394
)
 
$
(92,164
)
$
777,745

$
1,106,956

Net income



 

 

106,272

106,272

Other comprehensive income



 
3,657

 


3,657

Common stock issued:
 
 
 
 
 
 
 
 
 
Incentive plan
321

804

8,457

 

 



9,261

Dividend reinvestment plan
368


(2,743
)
 

 
14,829


12,086

Cash dividend declared ($.72 per share)



 

 

(61,885
)
(61,885
)
Treasury stock and other
(144
)

(55
)
 

 
(5,410
)

(5,465
)
Balance at June 30, 2016
86,076

$
221,642

$
215,590

 
$
(5,737
)
 
$
(82,745
)
$
822,132

$
1,170,882
Components of Accumulated Other Comprehensive Income (Loss), Net of Tax
The following table presents the changes in the components of accumulated other comprehensive income (loss), net of related tax effects:
(Thousands)
Available for Sale Securities
Cash Flow Hedges
Postemployment Benefit Obligation
Total
Balance at September 30, 2015
$
6,385

 
$
—

 
$
(15,779
)
 
$
(9,394
)
Other comprehensive income, net of tax
 
 
 
 
 
 
 
Other comprehensive income (loss), before reclassifications, net of tax of $(2,014), $10, $0, $(2,004)
2,888

 
(17
)
 
—

 
2,871

Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(10), $(523), $(533)
—

 
17

(1) 
769

(2) 
786

Net current-period other comprehensive income, net of tax of ($2,014), $0, $(523), $(2,537)
2,888

 
—

 
769

 
3,657

Balance at June 30, 2016
$
9,273

 
$
—

 
$
(15,010
)
 
$
(5,737
)
 
 
 
 
 
 
 
 
Balance at September 30, 2014
$
4,782

 
$
(93
)
 
$
(10,283
)
 
$
(5,594
)
Other comprehensive income (loss), net of tax
 
 
 
 
 
 
 
Other comprehensive (loss), before reclassifications, net of tax of $319, $146, $0, $465
(461
)
 
(256
)
 
—

 
(717
)
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(202), $(506), $(708)
—

 
349

(1) 
732

(2) 
1,081

Net current-period other comprehensive (loss) income, net of tax of $319, $(56), $(506), $(243)
(461
)
 
93

 
732

 
364

Balance as of June 30, 2015
$
4,321

 
$
—

 
$
(9,551
)
 
$
(5,230
)
(1)
Consists of realized losses related to foreign currency derivatives, which are reclassified to gas purchases on the Unaudited Condensed Consolidated Statements of Operations.
(2)
Included in the computation of net periodic pension cost, a component of operations and maintenance expense on the Unaudited Condensed Consolidated Statements of Operations.