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Consolidated Statements Of Income And Earnings Reinvested In The Business (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
INCOME        
Operating Revenues $ 339,815 $ 440,144 $ 1,459,851 $ 1,746,458
Operating Expenses        
Purchased Gas 27,038 86,628 344,728 577,005
Operation and Maintenance 110,697 107,232 356,525 352,794
Property, Franchise and Other Taxes 22,717 22,483 68,561 69,114
Depreciation, Depletion and Amortization 79,865 96,788 265,298 279,876
Impairment of Oil and Gas Producing Properties 588,712 0 709,060 0
Total Operating Expenses 829,029 313,131 1,744,172 1,278,789
Operating Income (Loss) (489,214) 127,013 (284,321) 467,669
Other Income (Expense):        
Interest Income 327 370 1,631 1,321
Other Income 2,066 1,496 4,638 6,847
Interest Expense on Long-Term Debt (22,213) (22,116) (66,900) (67,767)
Other Interest Expense (1,007) (1,136) (3,382) (3,460)
Income (Loss) Before Income Taxes (510,041) 105,627 (348,334) 404,610
Income Tax Expense (Benefit) (216,907) 41,107 (156,610) 162,627
Net Income (Loss) Available for Common Stock (293,134) 64,520 (191,724) 241,983
EARNINGS REINVESTED IN THE BUSINESS        
Balance at Beginning of Period 1,650,840 1,557,184 1,614,361 1,442,617
Beginning Retained Earnings Unappropriated And Current Period Net Income Loss 1,357,706 1,621,704 1,422,637 1,684,600
Dividends on Common Stock (33,388) (32,373) (98,319) (95,269)
Balance at June 30 $ 1,324,318 $ 1,589,331 $ 1,324,318 $ 1,589,331
Earnings Per Common Share, Basic:        
Net Income (Loss) Available for Common Stock (in dollars per share) $ (3.47) $ 0.77 $ (2.27) $ 2.89
Earnings Per Common Share, Diluted:        
Net Income (Loss) Available for Common Stock (in dollars per share) $ (3.44) $ 0.76 $ (2.25) $ 2.85
Weighted Average Common Shares Outstanding:        
Used in Basic Calculation (shares) 84,453,602 84,029,124 84,326,182 83,863,764
Used in Diluted Calculation (shares) 85,248,281 84,973,100 85,237,514 84,892,473
Dividends Per Common Share:        
Dividends Declared (in dollars per share) $ 0.395 $ 0.385 $ 1.165 $ 1.135