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Accumulated Other Comprehensive Income
 6 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income
We record deferred gains (losses) in AOCI related to available-for-sale securities, interest rate agreement cash flow hedges and commodity contract cash flow hedges. Deferred gains (losses) for our available-for-sale securities and commodity contract cash flow hedges are recognized in earnings upon settlement, while deferred gains (losses) related to our interest rate agreement cash flow hedges are recognized in earnings as they are amortized. 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, 2014
$
7,662

 
$
(18,381
)
 
$
(1,674
)
 
$
(12,393
)
Other comprehensive income (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
)

 
 
Available-
for-Sale
Securities
 
Interest
Rate
Agreement
Cash Flow
Hedges
 
Commodity
Contracts
Cash Flow
Hedges
 
Total
 
(In thousands)
September 30, 2013
$
5,448

 
$
37,906

 
$
(4,476
)
 
$
38,878

Other comprehensive income (loss) before reclassifications
2,369

 
(14,448
)
 
11,709

 
(370
)
Amounts reclassified from accumulated other comprehensive income
(227
)
 
1,343

 
(2,790
)
 
(1,674
)
Net current-period other comprehensive income (loss)
2,142

 
(13,105
)
 
8,919

 
(2,044
)
March 31, 2014
$
7,590

 
$
24,801

 
$
4,443

 
$
36,834




The following tables detail reclassifications out of AOCI for the three and six months ended March 31, 2015 and 2014. Amounts in parentheses below indicate decreases to net income in the statement of income.
 
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)
 
 
Available-for-sale securities
$
—

 
Operation and maintenance expense
 
—

 
Total before tax
 
—

 
Tax expense
 
$
—

 
Net of tax
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
 
$
(8,064
)
 
Net of tax
Total reclassifications
$
(8,064
)
 
Net of tax
 
Three Months Ended March 31, 2014
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
$
358

 
Operation and maintenance expense
 
358

 
Total before tax
 
(131
)
 
Tax expense
 
$
227

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(1,057
)
 
Interest charges
Commodity contracts
7,184

 
Purchased gas cost
 
6,127

 
Total before tax
 
(2,416
)
 
Tax expense
 
$
3,711

 
Net of tax
Total reclassifications
$
3,938

 
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
 
 
 
 
 
Six Months Ended March 31, 2014
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
$
358

 
Operation and maintenance expense
 
358

 
Total before tax
 
(131
)
 
Tax expense
 
$
227

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(2,115
)
 
Interest charges
Commodity contracts
4,574

 
Purchased gas cost
 
2,459

 
Total before tax
 
(1,012
)
 
Tax expense
 
$
1,447

 
Net of tax
Total reclassifications
$
1,674

 
Net of tax