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COMMON STOCK EQUITY (Tables)
 6 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Changes in Common Stock Equity
Changes in common stock equity during the six months ended March 31, 2017, 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, 2016
86,086

$
221,654

$
215,580

 
$
(15,155
)
 
$
(81,044
)
$
825,556

$
1,166,591

Net income



 

 

149,631

149,631

Other comprehensive income



 
7,558

 


7,558

Common stock issued:
 
 
 
 
 
 
 
 
 
Incentive plan
232

581

4,788

 

 



5,369

Dividend reinvestment plan (1)
279


(1,266
)
 

 
10,994


9,728

Cash dividend declared ($.51 per share)



 

 

(44,003
)
(44,003
)
Treasury stock and other
(233
)

(28
)
 

 
(8,566
)

(8,594
)
Balance at March 31, 2017
86,364

$
222,235

$
219,074

 
$
(7,597
)
 
$
(78,616
)
$
931,184

$
1,286,280


(1)
Shares sold through the DRP are issued from treasury stock at average cost, which may differ from the actual market price paid.
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 during the three months ended March 31, 2017 and 2016:
(Thousands)
Available for Sale Securities
Cash Flow Hedges
Postemployment Benefit Obligation
Total
Balance at December 31, 2016
$
9,713

 
$
—

 
$
(19,036
)
 
$
(9,323
)
Other comprehensive income (loss), net of tax
 
 
 
 
 
 
 
Other comprehensive income, before reclassifications, net of tax of $(1,808), $0, $0, $(1,808)
3,054

 
—

 
—

 
3,054

Amounts reclassified from accumulated other comprehensive income, net of tax of $1,138, $0, $(217), $921
(1,646
)
 
—

 
318

(2) 
(1,328
)
Net current-period other comprehensive income, net of tax of $(670), $0, $(217), $(887)
1,408

 
—

 
318

 
1,726

Balance at March 31, 2017
$
11,121

 
$
—

 
$
(18,718
)
 
$
(7,597
)
Balance as of December 31, 2015
$
10,086

 
$
(33
)
 
$
(15,523
)
 
$
(5,470
)
Other comprehensive income, net of tax
 
 
 
 
 
 
 
Other comprehensive income (loss), before reclassifications, net of tax of $(3,154), $(10), $0, $(3,164)
4,500

 
19

 
—

 
4,519

Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(11), $(175), $(186)
—

 
19

 
257

 
276

Net current-period other comprehensive income, net of tax of ($3,154), $(21), $(175), $(3,350)
4,500

 
38

 
257

 
4,795

Balance as of March 31, 2016
$
14,586

 
$
5

 
$
(15,266
)
 
$
(675
)

The following table presents the changes in the components of accumulated other comprehensive income (loss), net of related tax effects during the six months ended March 31, 2017 and 2016:
(Thousands)
Available for Sale Securities
Cash Flow Hedges
Postemployment Benefit Obligation
Total
Balance at 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 $(6,648), $0, $0, $(6,648)
10,096

 
—

 
—

 
10,096

Amounts reclassified from accumulated other comprehensive income, net of tax of $2,192, $0, $(434), $1,758
(3,173
)
 
—

 
635

(2) 
(2,538
)
Net current-period other comprehensive income, net of tax of $(4,456), $0, $(434), $(4,890)
6,923

 
—

 
635

 
7,558

Balance at March 31, 2017
$
11,121

 
$
—

 
$
(18,718
)
 
$
(7,597
)
Balance as of September 30, 2015
$
6,385

 
$
—

 
$
(15,779
)
 
$
(9,394
)
Other comprehensive income (loss), net of tax
 
 
 
 
 
 
 
Other comprehensive income (loss), before reclassifications, net of tax of $(5,768), $13, $0, $(5,755)
8,201

 
(22
)
 
—

 
8,179

Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(15), $(349), $(364)
—

 
27

(1) 
513

(2) 
540

Net current-period other comprehensive income, net of tax of ($5,768), $(2), $(349), $(6,119)
8,201

 
5

 
513

 
8,719

Balance as of March 31, 2016
$
14,586

 
$
5

 
$
(15,266
)
 
$
(675
)
(1)
Consists of realized losses related to foreign currency derivatives, which are reclassified to gas purchases on the Unaudited Condensed Consolidated Statements of Operations. Effective January 1, 2016, the Company elected not to designate its foreign currency derivatives as accounting hedges and, as a result, changes in fair value of the effective portion of the hedges are no longer recorded in OCI.
(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.