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Shareholders' Equity AOCI Affected Line Item in the Statement of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Operation and maintenance expense |  | $ (161,073) | $ (132,239) | $ (290,640) | $ (257,177)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  | 241,431 | 259,061 | 449,448 | 436,955
Income Tax Expense |  | (62,439) | (97,049) | 43,676 | (160,905)
Interest charges |  | (27,304) | (26,944) | (58,813) | (57,974)
Purchased gas cost |  | 626,960 | 427,494 | 993,877 | 738,799
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Income (loss) from continuing operations |  | 421 | (154) | 44 | 4,624
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Operation and maintenance expense |  | 1,139 | (107) | 1,139 | (107)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  | 1,139 | (107) | 1,139 | (107)
Income Tax Expense |  | (260) | 39 | (260) | 39
Income (loss) from continuing operations |  | 879 | (68) | 879 | (68)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  | (593) | (136) | (1,187) | 7,694
Income Tax Expense |  | 135 | 50 | 352 | (3,002)
Income (loss) from continuing operations |  | (458) | (86) | (835) | 4,692
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Commodity Contract [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Purchased gas cost | [1] |  |  |  | 7,967
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Interest Rate Contract [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Interest charges |  | $ (593) | $ (136) | $ (1,187) | $ (273)
[1] | Amount is presented as part of income from discontinued operations in the condensed consolidated statement of income.

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