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Shareholders' Equity
 9 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Shareholders' Equity
Shareholders' Equity

Shelf Registration and At-the-Market Equity Sales Program
On March 28, 2016, we filed a registration statement with the Securities and Exchange Commission (SEC) that originally permitted us to issue, from time to time, up to $2.5 billion in common stock and/or debt securities. We also filed a prospectus supplement under the registration statement relating to an at-the-market (ATM) equity distribution program under which we may issue and sell, shares of our common stock, up to an aggregate offering price of $200 million. During the nine months ended June 30, 2017, we sold 1,303,494 shares of common stock under our existing ATM program for $100 million and received net proceeds of $98.8 million. At June 30, 2017, approximately $1.6 billion of securities remained available for issuance under the shelf registration statement and substantially all shares have been issued under our ATM program.

Accumulated Other Comprehensive Income (Loss)
We record deferred gains (losses) in AOCI related to available-for-sale securities, interest rate 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 (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
1,485

 
76,602

 
9,847

 
87,934

Amounts reclassified from accumulated other comprehensive income
68

 
286

 
(4,865
)
 
(4,511
)
Net current-period other comprehensive income
1,553

 
76,888

 
4,982

 
83,423

June 30, 2017
$
6,037

 
$
(110,636
)
 
$
—

 
$
(104,599
)

 
 
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
)


The following tables detail reclassifications out of AOCI for the three and nine months ended June 30, 2017 and 2016. Amounts in parentheses below indicate decreases to net income in the statement of income:
 
Three Months Ended June 30, 2017
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
$
(177
)
 
Interest charges
Commodity contracts
—

 
Purchased gas cost
 
(177
)
 
Total before tax
 
64

 
Tax benefit
Total reclassifications
$
(113
)
 
Net of tax
 
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(1)
 
(12,484
)
 
Total before tax
 
4,865

 
Tax benefit
Total reclassifications
$
(7,619
)
 
Net of tax

 
 
 
 
 
 
 
 
 
Nine Months Ended June 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
$
(107
)
 
Operation and maintenance expense
 
(107
)
 
Total before tax
 
39

 
Tax benefit
 
$
(68
)
 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(450
)
 
Interest charges
Commodity contracts
7,976

 
Purchased gas cost(1)
 
7,526

 
Total before tax
 
(2,947
)
 
Tax expense
 
$
4,579

 
Net of tax
Total reclassifications
$
4,511

 
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(1)
 
(48,425
)
 
Total before tax
 
18,875

 
Tax benefit
 
$
(29,550
)
 
Net of tax
Total reclassifications
$
(29,471
)
 
Net of tax

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