XML 49 R38.htm IDEA: XBRL DOCUMENT v3.7.0.1
Shareholders' Equity AOCI Affected Line Item in the Statement of Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Operation and maintenance expense $ (132,239) $ (127,857) $ (257,177) $ (247,685)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest 259,061 223,768 436,955 386,081
Income Tax Expense (97,049) (80,765) (160,905) (141,532)
Interest charges (26,944) (27,559) (57,974) (57,096)
Purchased gas cost (427,494) (377,356) (738,799) (617,682)
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income (loss) from continuing operations (154) (7,756) 4,624 (21,852)
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 (107) 124
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest (107) 124 (107) 124
Income Tax Expense 39 (45) 39 (45)
Income (loss) from continuing operations (68) 79 (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 (136) (12,839) 7,703 (35,941)
Income Tax Expense 50 5,004 (3,011) 14,010
Income (loss) from continuing operations (86) (7,835) 4,692 (21,931)
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 (12,703) 7,976 (35,668)
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 $ (136) $ (136) $ (273) $ (273)
[1] Amounts are presented as part of income from discontinued operations on the condensed consolidated statements of income.