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Shareholders' Equity | 6 Months Ended
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Mar. 31, 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 March 31, 2018, approximately $1.2 billion 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 six months ended March 31, 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. We received aggregate gross proceeds of $400 million and received net proceeds, after expenses, of $395.1 million from the offering. 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 3, 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 (loss) before reclassifications | (167 | ) |  | 20,454 |  |  | 20,287 |
Amounts reclassified from accumulated other comprehensive income | (879 | ) |  | 835 |  |  | (44 | )
Net current-period other comprehensive income (loss) | (1,046 | ) |  | 21,289 |  |  | 20,243 |
March 31, 2018 | $ | 6,002 |  |  | $ | (91,013 | ) |  | $ | (85,011 | )
| 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 | )
The following tables detail reclassifications out of AOCI for the three and six months ended March 31, 2018 and 2017. Amounts in parentheses below indicate decreases to net income in the statement of income:
| Three Months Ended March 31, 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 | $ | 1,139 |  |  | Operation and maintenance expense
| 1,139 |  |  | Total before tax
| (260 | ) |  | Tax expense
| $ | 879 |  |  | Net of tax
Cash flow hedges |  |  |
Interest rate agreements | $ | (593 | ) |  | Interest charges
| (593 | ) |  | Total before tax
| 135 |  |  | Tax benefit
| $ | (458 | ) |  | Net of tax
Total reclassifications | $ | 421 |  |  | Net of tax
| 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
| (136 | ) |  | Total before tax
| 50 |  |  | Tax benefit
| $ | (86 | ) |  | Net of tax
Total reclassifications | $ | (154 | ) |  | Net of tax
| Six Months Ended March 31, 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 | $ | 1,139 |  |  | Operation and maintenance expense
| 1,139 |  |  | Total before tax
| (260 | ) |  | Tax expense
| $ | 879 |  |  | Net of tax
Cash flow hedges |  |  |
Interest rate agreements | $ | (1,187 | ) |  | Interest charges
| (1,187 | ) |  | Total before tax
| 352 |  |  | Tax benefit
| $ | (835 | ) |  | Net of tax
Total reclassifications | $ | 44 |  |  | 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 | 7,967 |  |  | Purchased gas cost(1)
| 7,694 |  |  | Total before tax
| (3,002 | ) |  | Tax expense
| $ | 4,692 |  |  | Net of tax
Total reclassifications | $ | 4,624 |  |  | Net of tax
(1) | Amount is presented as part of income from discontinued operations in the condensed consolidated statement of income.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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