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Shareholders' Equity (Table)
 12 Months Ended
Sep. 30, 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 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
)
 
 
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 income (loss) before reclassifications
(2,173
)
 
(71,003
)
 
(49,211
)
 
(122,387
)
Amounts reclassified from accumulated other comprehensive income
(540
)
 
542

 
25,448

 
25,450

Net current-period other comprehensive income (loss)
(2,713
)
 
(70,461
)
 
(23,763
)
 
(96,937
)
September 30, 2015
$
4,949

 
$
(88,842
)
 
$
(25,437
)
 
$
(109,330
)
Reclassification out of Accumulated Other Comprehensive Income
The following tables detail reclassifications out of AOCI for the fiscal years ended September 30, 2016 and 2015. Amounts in parentheses below indicate decreases to net income in the statement of income.
 
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
 
(53,197
)
 
Total before tax
 
20,733

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

 
Fiscal Year Ended September 30, 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
$
850

 
Operation and maintenance expense
 
850

 
Total before tax
 
(310
)
 
Tax expense
 
$
540

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(853
)
 
Interest charges
Commodity contracts
(41,716
)
 
Purchased gas cost
 
(42,569
)
 
Total before tax
 
16,579

 
Tax benefit
 
$
(25,990
)
 
Net of tax
Total reclassifications
$
(25,450
)
 
Net of tax