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Unaudited Interim Financial Information (Table)
9 Months Ended
Jun. 30, 2011
Accumulated Other Comprehensive Income Loss Table Abstract  
Accumulated other comprehensive income/loss table
   June 30, September 30,
   2011 2010
   (In thousands)
Accumulated other comprehensive income (loss):      
 Unrealized holding gains on investments $ 5,697 $ 4,205
 Treasury lock agreements   8,068   (5,468)
 Cash flow hedges   (8,019)   (22,109)
   $ 5,746 $ (23,372)
Comprehensive Income Loss Table Abstract  
Comprehensive income/loss table
   Three Months Ended Nine Months Ended
   June 30 June 30
   2011 2010 2011 2010
   (In thousands)
              
Net income (loss) $(566) $(3,154) $205,640 $204,302
Unrealized holding gains (losses) on            
 investments, net of tax expense (benefit)            
 of $(56) and $(996) for the three months            
 ended June 30, 2011 and 2010 and of            
 $876 and $(198) for the nine months            
 ended June 30, 2011 and 2010    (94)   (1,696)   1,492   (337)
Amortization, unrealized gain and unwinding            
 of interest rate hedging transactions, net of            
 tax expense (benefit) of $(4,629) and $247            
 for the three months ended June 30, 2011            
 and 2010 and $7,950 and $743 for the nine            
 month ended June 30, 2011 and 2010   (7,884)   422   13,536   1,265
Net unrealized gains (losses) on commodity            
 hedging transactions, net of tax expense            
 (benefit) of $(182) and $5,066 for the three            
 months ended June 30, 2011 and 2010 and            
 $9,008 and $2,999 for the nine months            
 ended June 30, 2011 and 2010   (285)   7,921   14,090   4,690
Comprehensive income (loss) $(8,829) $3,493 $234,758 $209,920
Regulatory Assets And Liabilities Table Abstract  
Regulatory assets and liabilities table
   June 30,  September 30,
   2011  2010
   (In thousands)
Regulatory assets:     
 Pension and postretirement benefit costs$ 200,393 $ 209,564
 Merger and integration costs, net  6,360   6,714
 Deferred gas costs  22,083   22,701
 Regulatory cost of removal asset  32,691   31,014
 Environmental costs  434   805
 Rate case costs  5,321   4,505
 Deferred franchise fees  393   1,161
 Other  3,940   1,046
  $ 271,615 $ 277,510
       
Regulatory liabilities:     
 Deferred gas costs$ 18,739 $ 43,333
 Deferred franchise fees  629   -
 Regulatory cost of removal obligation  429,354   381,474
 Other  9,166   6,112
  $ 457,888 $ 430,919