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Shareholders' Equity (Table)
 6 Months Ended
Mar. 31, 2016
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following tables provide the components of our accumulated other comprehensive income (loss) balances, net of the related tax effects allocated to each component of other comprehensive income.
 
Available-
for-Sale
Securities
 
Interest
Rate
Agreement
Cash Flow
Hedges
 
Commodity
Contracts
Cash Flow
Hedges
 
Total
 
(In thousands)
September 30, 2015
$
4,949

 
$
(88,842
)
 
$
(25,437
)
 
$
(109,330
)
Other comprehensive loss before reclassifications
(1,568
)
 
(49,008
)
 
(19,185
)
 
(69,761
)
Amounts reclassified from accumulated other comprehensive income
(79
)
 
173

 
21,758

 
21,852

Net current-period other comprehensive income (loss)
(1,647
)
 
(48,835
)
 
2,573

 
(47,909
)
March 31, 2016
$
3,302

 
$
(137,677
)
 
$
(22,864
)
 
$
(157,239
)

 
 
Available-
for-Sale
Securities
 
Interest
Rate
Agreement
Cash Flow
Hedges
 
Commodity
Contracts
Cash Flow
Hedges
 
Total
 
(In thousands)
September 30, 2014
$
7,662

 
$
(18,381
)
 
$
(1,674
)
 
$
(12,393
)
Other comprehensive loss before reclassifications
(101
)
 
(84,824
)
 
(38,902
)
 
(123,827
)
Amounts reclassified from accumulated other comprehensive income
(4
)
 
368

 
7,768

 
8,132

Net current-period other comprehensive income (loss)
(105
)
 
(84,456
)
 
(31,134
)
 
(115,695
)
March 31, 2015
$
7,557

 
$
(102,837
)
 
$
(32,808
)
 
$
(128,088
)
Reclassification out of Accumulated Other Comprehensive Income
The following tables detail reclassifications out of AOCI for the three and six months ended March 31, 2016 and 2015. Amounts in parentheses below indicate decreases to net income in the statement of income.
 
Three Months Ended March 31, 2016
Accumulated Other Comprehensive Income Components
Amount Reclassified from
Accumulated Other
Comprehensive Income      
 
Affected Line Item in the
Statement of Income
 
(In thousands)
 
 
Available-for-sale securities
$
124

 
Operation and maintenance expense
 
124

 
Total before tax
 
(45
)
 
Tax expense
 
$
79

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(136
)
 
Interest charges
Commodity contracts
(12,703
)
 
Purchased gas cost
 
(12,839
)
 
Total before tax
 
5,004

 
Tax benefit
 
$
(7,835
)
 
Net of tax
Total reclassifications
$
(7,756
)
 
Net of tax
 
Three Months Ended March 31, 2015
Accumulated Other Comprehensive Income Components
Amount Reclassified from
Accumulated Other
Comprehensive Income      
 
Affected Line Item in the
Statement of Income
 
(In thousands)
 
 
Cash flow hedges
 
 
 
Interest rate agreements
$
(136
)
 
Interest charges
Commodity contracts
(13,078
)
 
Purchased gas cost
 
(13,214
)
 
Total before tax
 
5,150

 
Tax benefit
Total reclassifications
$
(8,064
)
 
Net of tax
 
 
 
 
 
Six Months Ended March 31, 2016
Accumulated Other Comprehensive Income Components                          
Amount Reclassified from
Accumulated Other
Comprehensive Income      
 
Affected Line Item in  the
Statement of Income
 
(In thousands)
 
 
Available-for-sale securities
$
124

 
Operation and maintenance expense
 
124

 
Total before tax
 
(45
)
 
Tax expense
 
$
79

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(273
)
 
Interest charges
Commodity contracts
(35,668
)
 
Purchased gas cost
 
(35,941
)
 
Total before tax
 
14,010

 
Tax benefit
 
$
(21,931
)
 
Net of tax
Total reclassifications
$
(21,852
)
 
Net of tax
 
 
 
 
 
Six Months Ended March 31, 2015
Accumulated Other Comprehensive Income Components                          
Amount Reclassified from
Accumulated Other
Comprehensive Income      
 
Affected Line Item in  the
Statement of Income
 
(In thousands)
 
 
Available-for-sale securities
$
6

 
Operation and maintenance expense
 
6

 
Total before tax
 
(2
)
 
Tax expense
 
$
4

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(580
)
 
Interest charges
Commodity contracts
(12,734
)
 
Purchased gas cost
 
(13,314
)
 
Total before tax
 
5,178

 
Tax benefit
 
$
(8,136
)
 
Net of tax
Total reclassifications
$
(8,132
)
 
Net of tax