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Shareholders' Equity AOCI Affected Line Item in the Statement of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Operation and maintenance expense |  | $ (128,690) | $ (131,388) | $ (385,867) | $ (379,073)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  | 111,877 | 101,835 | 548,832 | 487,916
Income Tax Expense |  | (41,069) | (35,692) | (201,974) | (177,224)
Interest charges |  | (28,498) | (27,679) | (86,472) | (84,775)
Purchased gas cost |  | (114,176) | (64,583) | (852,975) | (682,265)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Income (loss) from continuing operations |  | (113) | (7,619) | 4,511 | (29,471)
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 |  |  |  | (107) | 124
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  | (107) | 124
Income Tax Expense |  |  |  | 39 | (45)
Income (loss) from continuing operations |  |  |  | (68) | 79
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 |  | (177) | (12,484) | 7,526 | (48,425)
Income Tax Expense |  | 64 | 4,865 | (2,947) | 18,875
Income (loss) from continuing operations |  |  |  | 4,579 | (29,550)
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] | 0 | (12,347) | 7,976 | (48,015)
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 |  | $ (177) | $ (137) | $ (450) | $ (410)
[1] | Amounts are presented as part of income from discontinued operations on the condensed consolidated statements of income.

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