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Shareholders' Equity
 9 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Shareholders' Equity
Shareholders' Equity

Shelf Registration, At-the-Market Equity Sales Program and Equity Issuance
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, which expires March 28, 2019. At June 30, 2018, approximately $650 million of securities remained available for issuance under the shelf registration statement.
On November 14, 2017, we filed a prospectus supplement under the registration statement relating to an at-the-market (ATM) equity sales program under which we may issue and sell shares of our common stock up to an aggregate offering price of $500 million, which expires March 28, 2019. During the nine months ended June 30, 2018, no shares of common stock were sold under the ATM program.
On November 30, 2017, we filed a prospectus supplement under the registration statement relating to an underwriting agreement to sell 4,558,404 shares of our common stock for $400 million. After expenses, net proceeds from the offering were $395.1 million.

Accumulated Other Comprehensive Income (Loss)
We record deferred gains (losses) in AOCI related to available-for-sale securities, interest rate cash flow hedges and prior to the sale of Atmos Energy Marketing, LLC (AEM) on January 1, 2017, 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
 
Total
 
(In thousands)
September 30, 2017
$
7,048

 
$
(112,302
)
 
$
(105,254
)
Other comprehensive income before reclassifications
148

 
28,315

 
28,463

Amounts reclassified from accumulated other comprehensive income
(884
)
 
1,294

 
410

Net current-period other comprehensive income (loss)
(736
)
 
29,609

 
28,873

June 30, 2018
$
6,312

 
$
(82,693
)
 
$
(76,381
)

 
 
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
)


The following tables detail reclassifications out of AOCI for the three and nine months ended June 30, 2018 and 2017. Amounts in parentheses below indicate decreases to net income in the statement of income:
 
Three Months Ended June 30, 2018
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
$
7

 
Operation and maintenance expense
 
7

 
Total before tax
 
(2
)
 
Tax expense
 
$
5

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(594
)
 
Interest charges
 
(594
)
 
Total before tax
 
135

 
Tax benefit
 
$
(459
)
 
Net of tax
Total reclassifications
$
(454
)
 
Net of tax
 
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
 
(177
)
 
Total before tax
 
64

 
Tax benefit
Total reclassifications
$
(113
)
 
Net of tax

 
Nine Months Ended June 30, 2018
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
$
1,146

 
Operation and maintenance expense
 
1,146

 
Total before tax
 
(262
)
 
Tax expense
 
$
884

 
Net of tax
Cash flow hedges
 
 
 
Interest rate agreements
$
(1,781
)
 
Interest charges
 
(1,781
)
 
Total before tax
 
487

 
Tax benefit
 
$
(1,294
)
 
Net of tax
Total reclassifications
$
(410
)
 
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
7,967

 
Purchased gas cost(1)
 
7,517

 
Total before tax
 
(2,938
)
 
Tax expense
 
$
4,579

 
Net of tax
Total reclassifications
$
4,511

 
Net of tax

(1)
Amount is presented as part of income from discontinued operations in the condensed consolidated statement of income.