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Shareholders' Equity (Table) | 6 Months Ended
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Mar. 31, 2018
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 |  | 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 | )
Reclassification out of Accumulated Other Comprehensive Income | 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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