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Shareholders' Equity (Table)
 9 Months Ended
Jun. 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 (loss).
 
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
(1,417
)
 
(88,345
)
 
(8,612
)
 
(98,374
)
Amounts reclassified from accumulated other comprehensive income
(79
)
 
260

 
29,290

 
29,471

Net current-period other comprehensive income (loss)
(1,496
)
 
(88,085
)
 
20,678

 
(68,903
)
June 30, 2016
$
3,453

 
$
(176,927
)
 
$
(4,759
)
 
$
(178,233
)

 
 
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
30

 
(30,436
)
 
(37,397
)
 
(67,803
)
Amounts reclassified from accumulated other comprehensive income
(326
)
 
455

 
17,826

 
17,955

Net current-period other comprehensive income (loss)
(296
)
 
(29,981
)
 
(19,571
)
 
(49,848
)
June 30, 2015
$
7,366

 
$
(48,362
)
 
$
(21,245
)
 
$
(62,241
)
Reclassification out of Accumulated Other Comprehensive Income
The following tables detail reclassifications out of AOCI for the three and nine months ended June 30, 2016 and 2015. Amounts in parentheses below indicate decreases to net income in the statement of income.
 
Three Months Ended June 30, 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
(12,347
)
 
Purchased gas cost
 
(12,484
)
 
Total before tax
 
4,865

 
Tax benefit
Total reclassifications
$
(7,619
)
 
Net of tax
 
Three Months Ended June 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
$
508

 
Operation and maintenance expense
 
508

 
Total before tax
 
(186
)
 
Tax expense
 
$
322

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(137
)
 
Interest charges
Commodity contracts
(16,488
)
 
Purchased gas cost
 
(16,625
)
 
Total before tax
 
6,480

 
Tax benefit
 
$
(10,145
)
 
Net of tax
Total reclassifications
$
(9,823
)
 
Net of tax
 
 
 
 
 
Nine Months Ended June 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
$
124

 
Operation and maintenance expense
 
124

 
Total before tax
 
(45
)
 
Tax expense
 
$
79

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(410
)
 
Interest charges
Commodity contracts
(48,015
)
 
Purchased gas cost
 
(48,425
)
 
Total before tax
 
18,875

 
Tax benefit
 
$
(29,550
)
 
Net of tax
Total reclassifications
$
(29,471
)
 
Net of tax
 
 
 
 
 
Nine Months Ended June 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
$
514

 
Operation and maintenance expense
 
514

 
Total before tax
 
(188
)
 
Tax expense
 
$
326

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(717
)
 
Interest charges
Commodity contracts
(29,222
)
 
Purchased gas cost
 
(29,939
)
 
Total before tax
 
11,658

 
Tax benefit
 
$
(18,281
)
 
Net of tax
Total reclassifications
$
(17,955
)
 
Net of tax