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Shareholders' Equity | 9 Months Ended
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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.

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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 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e716-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e709-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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