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Shareholders' Equity (Table)
 3 Months Ended
Dec. 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 (loss).
 
Available-
for-Sale
Securities
 
Interest
Rate
Agreement
Cash Flow
Hedges
 
Commodity
Contracts
Cash Flow
Hedges
 
Total
 
(In thousands)
September 30, 2016
$
4,484

 
$
(187,524
)
 
$
(4,982
)
 
$
(188,022
)
Other comprehensive income (loss) before reclassifications
(828
)
 
91,127

 
9,847

 
100,146

Amounts reclassified from accumulated other comprehensive income
—

 
87

 
(4,865
)
 
(4,778
)
Net current-period other comprehensive income (loss)
(828
)
 
91,214

 
4,982

 
95,368

December 31, 2016
$
3,656

 
$
(96,310
)
 
$
—

 
$
(92,654
)

 
 
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 income (loss) before reclassifications
(768
)
 
4,696

 
(11,656
)
 
(7,728
)
Amounts reclassified from accumulated other comprehensive income
—

 
87

 
14,009

 
14,096

Net current-period other comprehensive income (loss)
(768
)
 
4,783

 
2,353

 
6,368

December 31, 2015
$
4,181

 
$
(84,059
)
 
$
(23,084
)
 
$
(102,962
)
Reclassification out of Accumulated Other Comprehensive Income
The following tables detail reclassifications out of AOCI for the three months ended December 31, 2016 and 2015. Amounts in parentheses below indicate decreases to net income in the statement of income.
 
Three Months Ended December 31, 2016
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
$
(137
)
 
Interest charges
Commodity contracts
7,976

 
Purchased gas cost(1)
 
7,839

 
Total before tax
 
(3,061
)
 
Tax expense
Total reclassifications
$
4,778

 
Net of tax
 
Three Months Ended December 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
$
(137
)
 
Interest charges
Commodity contracts
(22,965
)
 
Purchased gas cost(1)
 
(23,102
)
 
Total before tax
 
9,006

 
Tax benefit
Total reclassifications
$
(14,096
)
 
Net of tax
(1)Amounts are presented as part of income from discontinued operations on the condensed consolidated statements of income.