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Shareholders' Equity (Table)
 12 Months Ended
Sep. 30, 2017
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, 2016
$
4,484

 
$
(187,524
)
 
$
(4,982
)
 
$
(188,022
)
Other comprehensive income (loss) before reclassifications
2,502

 
74,560

 
9,847

 
86,909

Amounts reclassified from accumulated other comprehensive income
62

 
662

 
(4,865
)
 
(4,141
)
Net current-period other comprehensive income
2,564

 
75,222

 
4,982

 
82,768

September 30, 2017
$
7,048

 
$
(112,302
)
 
$
—

 
$
(105,254
)
 
 
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
(263
)
 
(99,029
)
 
(11,662
)
 
(110,954
)
Amounts reclassified from accumulated other comprehensive income
(202
)
 
347

 
32,117

 
32,262

Net current-period other comprehensive income (loss)
(465
)
 
(98,682
)
 
20,455

 
(78,692
)
September 30, 2016
$
4,484

 
$
(187,524
)
 
$
(4,982
)
 
$
(188,022
)
Reclassification out of Accumulated Other Comprehensive Income
The following tables detail reclassifications out of AOCI for the fiscal years ended September 30, 2017 and 2016. Amounts in parentheses below indicate decreases to net income in the statement of income.
 
Fiscal Year Ended September 30, 2017
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
$
(97
)
 
Operation and maintenance expense
 
(97
)
 
Total before tax
 
35

 
Tax benefit
 
$
(62
)
 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(1,043
)
 
Interest charges
Commodity contracts
7,967

 
Purchased gas cost(1)
 
6,924

 
Total before tax
 
(2,721
)
 
Tax expense
 
$
4,203

 
Net of tax
Total reclassifications
$
4,141

 
Net of tax

 
Fiscal Year Ended September 30, 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
$
318

 
Operation and maintenance expense
 
318

 
Total before tax
 
(116
)
 
Tax expense
 
$
202

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(546
)
 
Interest charges
Commodity contracts
(52,651
)
 
Purchased gas cost(1)
 
(53,197
)
 
Total before tax
 
20,733

 
Tax benefit
 
$
(32,464
)
 
Net of tax
Total reclassifications
$
(32,262
)
 
Net of tax

(1)
Amounts are presented as part of income from discontinued operations on the consolidated statements of income.