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Financial Instruments (Table)
3 Months Ended
Dec. 31, 2011
Financial Instruments Note Tables Abstract  
Oustanding commodity contracts volumes table
    Natural  
  Hedge Gas  
Contract Type Designation Distribution Nonregulated
    Quantity (MMcf)
       
Commodity contracts Fair Value  -  (26,690)
  Cash Flow  -  44,428
  Not designated  13,964  46,944
     13,964  64,682
Financial instruments on the balance sheet
        Natural     
        Gas     
     Balance Sheet Location Distribution Nonregulated Total
December 31, 2011:    (In thousands)
                
Designated As Hedges:            
 Asset Financial Instruments            
  Current commodity contracts Other current assets $ - $ 60,222 $ 60,222
  Noncurrent commodity Deferred charges and         
   contracts  other assets   -   58   58
                
 Liability Financial Instruments            
  Current commodity contracts Other current liabilities   -   (57,988)   (57,988)
  Noncurrent commodity Deferred credits and         
   contracts  other liabilities   (69,755)   (12,012)   (81,767)
 Total       (69,755)   (9,720)   (79,475)
                
Not Designated As Hedges:            
 Asset Financial Instruments            
  Current commodity contracts Other current assets   292   148,669   148,961
  Noncurrent commodity Deferred charges and         
   contracts  other assets   180   80,916   81,096
                
 Liability Financial Instruments            
  Current commodity contracts Other current liabilities(1)   (16,196)   (166,878)   (183,074)
  Noncurrent commodity Deferred credits and         
   contracts  other liabilities   (350)   (68,250)   (68,600)
 Total       (16,074)   (5,543)   (21,617)
Total Financial Instruments    $ (85,829) $ (15,263) $ (101,092)

        Natural     
        Gas     
     Balance Sheet Location Distribution Nonregulated Total
September 30, 2011:    (In thousands)
                
Designated As Hedges:            
 Asset Financial Instruments            
  Current commodity contracts Other current assets $ - $ 22,396 $ 22,396
  Noncurrent commodity Deferred charges and         
   contracts  other assets   -   174   174
                
 Liability Financial Instruments            
  Current commodity contracts Other current liabilities   -   (31,064)   (31,064)
  Noncurrent commodity Deferred credits and         
   contracts  other liabilities   (67,527)   (7,709)   (75,236)
 Total       (67,527)   (16,203)   (83,730)
                
Not Designated As Hedges:            
 Asset Financial Instruments            
  Current commodity contracts Other current assets   843   67,710   68,553
  Noncurrent commodity Deferred charges and         
   contracts  other assets   998   22,379   23,377
                
 Liability Financial Instruments            
  Current commodity contracts Other current liabilities(1)   (13,256)   (73,865)   (87,121)
  Noncurrent commodity Deferred credits and         
   contracts  other liabilities   (335)   (25,071)   (25,406)
 Total       (11,750)   (8,847)   (20,597)
Total Financial Instruments    $ (79,277) $ (25,050) $ (104,327)
Fair value hedges table
        
   Three Months Ended
   December 31
   2011 2010
   (In thousands)
        
Commodity contracts $ 24,064 $ (1,723)
Fair value adjustment for natural gas      
 inventory designated as the hedged item   (15,249)   15,625
Total impact on revenue $ 8,815 $ 13,902
        
The impact on revenue is comprised of      
the following:      
 Basis ineffectiveness $ 841 $ 921
 Timing ineffectiveness   7,974   12,981
   $ 8,815 $ 13,902
Cash flow hedges table
  Three Months Ended
  December 31
  2011 2010
  (In thousands)
       
Increase (decrease) in fair value:     
 Treasury lock agreements$ (1,403) $ 31,425
 Forward commodity contracts  (23,678)   1,657
Recognition of losses in earnings due to settlements:     
 Treasury lock agreements  316   422
 Forward commodity contracts  7,103   8,693
Total other comprehensive income (loss)     
 from hedging, net of tax(1)$ (17,662) $ 42,197
Other comprehensive income from hedging table
  Treasury    
  Lock Commodity  
  Agreements Contracts Total
  (In thousands)
          
Next twelve months $ (1,266) $ (25,900) $ (27,166)
Thereafter   9,967   (7,536)   2,431
Total(1) $ 8,701 $ (33,436) $ (24,735)
Expected recognition in earnings of deferred losses in AOCI table
   Three Months Ended December 31, 2011
   Natural    
   Gas    
   Distribution Nonregulated Consolidated
   (In thousands)
           
Loss reclassified from AOCI into revenue         
 for effective portion of commodity contracts $ - $ (11,642) $ (11,642)
Loss arising from ineffective portion of          
 commodity contracts    -   (430)   (430)
Total impact on revenue   -   (12,072)   (12,072)
Loss on settled Treasury lock agreements         
 reclassified from AOCI into interest expense   (502)   -   (502)
Total Impact from Cash Flow Hedges $ (502) $ (12,072) $ (12,574)
           
   Three Months Ended December 31, 2010
   Natural    
   Gas    
   Distribution Nonregulated Consolidated
   (In thousands)
           
Loss reclassified from AOCI into revenue         
 for effective portion of commodity contracts $ - $ (14,253) $ (14,253)
Loss arising from ineffective portion of          
 commodity contracts    -   (444)   (444)
Total impact on revenue   -   (14,697)   (14,697)
Loss on settled Treasury lock agreements         
 reclassified from AOCI into interest expense   (670)   -   (670)
Total Impact from Cash Flow Hedges $ (670) $ (14,697) $ (15,367)