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Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies (Reclassification Out of Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Operating Revenues $ 366,623 $ 440,144 $ 756,242 $ 550,072 $ 338,863 $ 440,008 $ 597,826 $ 452,854 $ 2,113,081 $ 1,829,551 $ 1,626,853
Purchased Gas                 (605,838) (460,432) (415,589)
Other Income                 9,461 4,697 5,133
Income Before Income Taxes                 489,027 432,759 370,631
Income Tax Expense                 (189,614) (172,758) (150,554)
Net Income Available for Common Stock 57,431 64,520 95,210 [1] 82,252 47,842 [2] 58,495 85,720 67,944 299,413 260,001 220,077
Amount Of Gain Or (Loss) Reclassified From Accumulated Other Comprehensive Loss [Member]
                     
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Income Before Income Taxes                 (26,188)    
Income Tax Expense                 12,643    
Net Income Available for Common Stock                 (13,545)    
Amount Of Gain Or (Loss) Reclassified From Accumulated Other Comprehensive Loss [Member] | Gains and Losses on Securities Available for Sale [Member]
                     
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other Income                 662    
Amount Of Gain Or (Loss) Reclassified From Accumulated Other Comprehensive Loss [Member] | Amortization of Prior Year Funded Status of Pension and Other Post-Retirement Benefit Plans [Member] | Prior Service Credit [Member]
                     
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net periodic benefit cost                 131 [3]    
Amount Of Gain Or (Loss) Reclassified From Accumulated Other Comprehensive Loss [Member] | Amortization of Prior Year Funded Status of Pension and Other Post-Retirement Benefit Plans [Member] | Net Actuarial Loss [Member]
                     
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net periodic benefit cost                 (9,334) [3]    
Amount Of Gain Or (Loss) Reclassified From Accumulated Other Comprehensive Loss [Member] | Commodity Contract [Member] | Gains and Losses on Derivative Financial Instruments [Member]
                     
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Operating Revenues                 (14,880)    
Purchased Gas                 $ (2,767)    
[1] Includes $3.6 million of income associated with a death benefit gain on life insurance proceeds recorded in the Corporate category.
[2] Includes a $4.7 million refund provision recorded in the Utility segment related to various issues raised in Distribution Corporation’s rate proceeding in New York.
[3] These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost. Refer to Note H — Retirement Plan and Other Post-Retirement Benefits for additional details.