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Shareholders' Equity (Table)
6 Months Ended
Mar. 31, 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 (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 before reclassifications
634

 
95,271

 
9,847

 
105,752

Amounts reclassified from accumulated other comprehensive income
68

 
173

 
(4,865
)
 
(4,624
)
Net current-period other comprehensive income
702

 
95,444

 
4,982

 
101,128

March 31, 2017
$
5,186

 
$
(92,080
)
 
$

 
$
(86,894
)

 
 
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
(1,568
)
 
(49,008
)
 
(19,185
)
 
(69,761
)
Amounts reclassified from accumulated other comprehensive income
(79
)
 
173

 
21,758

 
21,852

Net current-period other comprehensive income (loss)
(1,647
)
 
(48,835
)
 
2,573

 
(47,909
)
March 31, 2016
$
3,302

 
$
(137,677
)
 
$
(22,864
)
 
$
(157,239
)
Reclassification out of Accumulated Other Comprehensive Income
The following tables detail reclassifications out of AOCI for the three and six months ended March 31, 2017 and 2016. Amounts in parentheses below indicate decreases to net income in the statement of income.
 
Three Months Ended March 31, 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
$
(107
)
 
Operation and maintenance expense
 
(107
)
 
Total before tax
 
39

 
Tax benefit
 
$
(68
)
 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(136
)
 
Interest charges
Commodity contracts

 
Purchased gas cost
 
(136
)
 
Total before tax
 
50

 
Tax benefit
 
$
(86
)
 
Net of tax
Total reclassifications
$
(154
)
 
Net of tax
 
Three Months Ended March 31, 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
$
(136
)
 
Interest charges
Commodity contracts
(12,703
)
 
Purchased gas cost(1)
 
(12,839
)
 
Total before tax
 
5,004

 
Tax benefit
 
$
(7,835
)
 
Net of tax
Total reclassifications
$
(7,756
)
 
Net of tax

 
 
 
 
 
 
 
 
 
Six Months Ended March 31, 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
$
(107
)
 
Operation and maintenance expense
 
(107
)
 
Total before tax
 
39

 
Tax benefit
 
$
(68
)
 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(273
)
 
Interest charges
Commodity contracts
7,976

 
Purchased gas cost(1)
 
7,703

 
Total before tax
 
(3,011
)
 
Tax expense
 
$
4,692

 
Net of tax
Total reclassifications
$
4,624

 
Net of tax
 
 
 
 
 
 
 
 
 
Six Months Ended March 31, 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
$
(273
)
 
Interest charges
Commodity contracts
(35,668
)
 
Purchased gas cost(1)
 
(35,941
)
 
Total before tax
 
14,010

 
Tax benefit
 
$
(21,931
)
 
Net of tax
Total reclassifications
$
(21,852
)
 
Net of tax

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