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Financial Instruments (Table)
 9 Months Ended
Jun. 30, 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  -  (20,915)
  Cash Flow  -  28,317
  Not designated  16,340  18,140
     16,340  25,542
Financial instruments on the balance sheet
        Natural     
        Gas     
     Balance Sheet Location Distribution Nonregulated Total
June 30, 2011    (In thousands)
                
Designated As Hedges:            
 Asset Financial Instruments            
  Current commodity contracts Other current assets $ - $ 11,529 $ 11,529
  Noncurrent commodity Deferred charges and         
   contracts  other assets   -   241   241
                
 Liability Financial Instruments            
  Current commodity contracts Other current liabilities   -   (15,930)   (15,930)
  Noncurrent commodity Deferred credits and         
   contracts  other liabilities   -   (6,237)   (6,237)
 Total       -   (10,397)   (10,397)
                
Not Designated As Hedges:            
 Asset Financial Instruments            
  Current commodity contracts Other current assets   1,972   19,174   21,146
  Noncurrent commodity Deferred charges and         
   contracts  other assets   767   7,093   7,860
                
 Liability Financial Instruments            
  Current commodity contracts Other current liabilities   (5,207)   (20,109)   (25,316)
  Noncurrent commodity Deferred credits and         
   contracts  other liabilities   (56)   (7,170)   (7,226)
 Total       (2,524)   (1,012)   (3,536)
Total Financial Instruments    $ (2,524) $ (11,409) $ (13,933)

        Natural     
        Gas     
     Balance Sheet Location Distribution Nonregulated Total
September 30, 2010    (In thousands)
                
Designated As Hedges:            
 Asset Financial Instruments            
  Current commodity contracts Other current assets $ - $ 40,030 $ 40,030
  Noncurrent commodity Deferred charges and         
   contracts  other assets   -   2,461   2,461
                
 Liability Financial Instruments            
  Current commodity contracts Other current liabilities   -   (56,575)   (56,575)
  Noncurrent commodity Deferred credits and         
   contracts  other liabilities   -   (9,222)   (9,222)
 Total       -   (23,306)   (23,306)
                
Not Designated As Hedges:            
 Asset Financial Instruments            
  Current commodity contracts Other current assets   2,219   16,459   18,678
  Noncurrent commodity Deferred charges and         
   contracts  other assets   47   2,056   2,103
                
 Liability Financial Instruments            
  Current commodity contracts Other current liabilities   (48,942)   (7,178)   (56,120)
  Noncurrent commodity Deferred credits and         
   contracts  other liabilities   (2,924)   (405)   (3,329)
 Total       (49,600)   10,932   (38,668)
Total Financial Instruments    $ (49,600) $ (12,374) $ (61,974)
Fair value hedges table
   Three Months Ended June 30
   2011 2010
   (In thousands)
        
Commodity contracts $ 7,837 $ (10,525)
Fair value adjustment for natural gas      
 inventory designated as the hedged item   (1,781)   14,678
Total impact on revenue $ 6,056 $ 4,153
        
The impact on revenue is comprised of      
the following:      
 Basis ineffectiveness $ 853 $ (235)
 Timing ineffectiveness   5,203   4,388
   $ 6,056 $ 4,153
        
        
   Nine Months Ended June 30
   2011 2010
    (In thousands)
        
Commodity contracts $ 4,834 $ 20,296
Fair value adjustment for natural gas      
 inventory designated as the hedged item   19,430   26,195
Total impact on revenue $ 24,264 $ 46,491
        
The impact on revenue is comprised of      
the following:      
 Basis ineffectiveness $ 1,265 $ (684)
 Timing ineffectiveness   22,999   47,175
   $ 24,264 $ 46,491
Cash flow hedges table
   Three Months Ended June 30, 2011
   Natural  Regulated    
   Gas  Transmission    
   Distribution  and Storage Nonregulated Consolidated
   (In thousands)
              
Loss reclassified from AOCI into revenue            
 for effective portion of commodity contracts $ - $ - $ (3,907) $ (3,907)
Loss arising from ineffective portion of             
 commodity contracts    -   -   (281)   (281)
Total impact on revenue   -   -   (4,188)   (4,188)
Loss on settled Treasury lock agreements            
 reclassified from AOCI into interest expense   (614)   -   -   (614)
Total Impact from Cash Flow Hedges $ (614) $ - $ (4,188) $ (4,802)
              
   Three Months Ended June 30, 2010
   Natural  Regulated    
   Gas  Transmission    
   Distribution  and Storage Nonregulated Consolidated
   (In thousands)
              
Loss reclassified from AOCI into revenue            
 for effective portion of commodity contracts $ - $ - $ (8,523) $ (8,523)
Loss arising from ineffective portion of             
 commodity contracts    -   -   (350)   (350)
Total impact on revenue   -   -   (8,873)   (8,873)
Loss on settled Treasury lock agreements            
 reclassified from AOCI into interest expense   (669)   -   -   (669)
Total Impact from Cash Flow Hedges $ (669) $ - $ (8,873) $ (9,542)
              
   Nine Months Ended June 30, 2011
   Natural  Regulated    
   Gas  Transmission    
   Distribution  and Storage Nonregulated Consolidated
   (In thousands)
              
Loss reclassified from AOCI into revenue            
 for effective portion of commodity contracts $ - $ - $ (25,488) $ (25,488)
Loss arising from ineffective portion of             
 commodity contracts    -   -   (958)   (958)
Total impact on revenue   -   -   (26,446)   (26,446)
Loss on settled Treasury lock agreements            
 reclassified from AOCI into interest expense   (1,953)   -   -   (1,953)
Gain on unwinding of Treasury lock reclassified            
 from AOCI into miscellaneous income   21,803   6,000   -   27,803
Total Impact from Cash Flow Hedges $ 19,850 $ 6,000 $ (26,446) $ (596)
              
   Nine Months Ended June 30, 2010
   Natural  Regulated    
   Gas  Transmission    
   Distribution  and Storage Nonregulated Consolidated
   (In thousands)
              
Loss reclassified from AOCI into revenue            
 for effective portion of commodity contracts $ - $ - $ (40,196) $ (40,196)
Loss arising from ineffective portion of             
 commodity contracts    -   -   (2,307)   (2,307)
Total impact on revenue   -   -   (42,503)   (42,503)
Loss on settled Treasury lock agreements            
 reclassified from AOCI into interest expense   (2,008)   -   -   (2,008)
Total Impact from Cash Flow Hedges $ (2,008) $ - $ (42,503) $ (44,511)
Other comprehensive income from hedging table
  Three Months Ended Nine Months Ended
  June 30 June 30
  2011 2010 2011 2010
  (In thousands)
             
Increase (decrease) in fair value:           
 Treasury lock agreements$ (8,270) $ - $ 29,822 $ -
 Forward commodity contracts  (2,668)   2,722   (1,457)   (19,829)
Recognition of (gains) losses in earnings due to            
 settlements:           
 Treasury lock agreements  386   422   (16,286)   1,265
 Forward commodity contracts  2,383   5,199   15,547   24,519
Total other comprehensive income (loss) from           
 hedging, net of tax(1)$ (8,169) $ 8,343 $ 27,626 $ 5,955
Expected recognition in earnings of deferred losses in AOCI table
  Treasury    
  Lock Commodity  
  Agreements Contracts Total
  (In thousands)
          
Next twelve months $ (1,266) $ (3,905) $ (5,171)
Thereafter   9,334   (4,114)   5,220
Total(1) $ 8,068 $ (8,019) $ 49