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Financial Instruments (Table)
6 Months Ended
Mar. 31, 2012
Financial Instruments [Abstract]  
Oustanding commodity contracts volumes table
    Natural  
  Hedge Gas  
Contract Type Designation Distribution Nonregulated
    Quantity (MMcf)
       
Commodity contracts Fair Value  -  (38,340)
  Cash Flow  -  49,098
  Not designated  6,033  28,190
     6,033  38,948
Financial instruments on the balance sheet
       Natural     
       Gas     
     Balance Sheet LocationDistribution Nonregulated Total
March 31, 2012   (In thousands)
               
Designated As Hedges:           
 Asset Financial Instruments           
  Current commodity contracts Other current assets$ - $ 77,441 $ 77,441
  Noncurrent commodity Deferred charges and        
   contracts  other assets  -   -   -
               
 Liability Financial Instruments           
  Current commodity contracts Other current liabilities  (45,818)   (59,301)   (105,119)
  Noncurrent commodity Deferred credits and        
   contracts  other liabilities  -   (10,914)   (10,914)
 Total      (45,818)   7,226   (38,592)
               
Not Designated As Hedges:           
 Asset Financial Instruments           
  Current commodity contracts Other current assets  502   137,934   138,436
  Noncurrent commodity Deferred charges and        
   contracts  other assets  -   85,951   85,951
               
 Liability Financial Instruments           
  Current commodity contracts Other current liabilities(1)  (2,215)   (164,189)   (166,404)
  Noncurrent commodity Deferred credits and        
   contracts  other liabilities  (1)   (69,496)   (69,497)
 Total      (1,714)   (9,800)   (11,514)
Total Financial Instruments   $ (47,532) $ (2,574) $ (50,106)

       Natural     
       Gas     
     Balance Sheet LocationDistribution 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 March 31
   2012 2011
   (In thousands)
        
Commodity contracts $ 29,090 $ (1,279)
Fair value adjustment for natural gas      
 inventory designated as the hedged item   (35,087)   5,586
Total impact on revenue $ (5,997) $ 4,307
        
The impact on revenue is comprised of      
the following:      
 Basis ineffectiveness $ (739) $ (509)
 Timing ineffectiveness   (5,258)   4,816
   $ (5,997) $ 4,307
        
        
   Six Months Ended March 31
   2012 2011
    (In thousands)
        
Commodity contracts $ 53,153 $ (3,003)
Fair value adjustment for natural gas      
 inventory designated as the hedged item   (50,335)   21,211
Total impact on revenue $ 2,818 $ 18,208
        
The impact on revenue is comprised of      
the following:      
 Basis ineffectiveness $ 102 $ 412
 Timing ineffectiveness   2,716   17,796
   $ 2,818 $ 18,208
Cash flow hedges [Table Text Block]
   Three Months Ended March 31, 2012
   Natural Regulated    
   Gas Transmission    
   Distribution and Storage Nonregulated Consolidated
   (In thousands)
              
Loss reclassified from AOCI into revenue            
 for effective portion of commodity contracts $ - $ - $ (21,181) $ (21,181)
Loss arising from ineffective portion of             
 commodity contracts    -   -   (238)   (238)
Total impact on revenue   -   -   (21,419)   (21,419)
Loss on settled Treasury lock agreements            
 reclassified from AOCI into interest expense   (502)   -   -   (502)
Total Impact from Cash Flow Hedges $ (502) $ - $ (21,419) $ (21,921)
              
   Three Months Ended March 31, 2011
   Natural Regulated    
   Gas Transmission    
   Distribution and Storage Nonregulated Consolidated
   (In thousands)
              
Loss reclassified from AOCI into revenue            
 for effective portion of commodity contracts $ - $ - $ (7,328) $ (7,328)
Loss arising from ineffective portion of             
 commodity contracts    -   -   (233)   (233)
Total impact on revenue   -   -   (7,561)   (7,561)
Loss on settled Treasury lock agreements            
 reclassified from AOCI into interest expense   (669)   -   -   (669)
Gain on unwinding of Treasury lock reclassified            
 from AOCI into miscellaneous income   21,803   6,000   -   27,803
Total Impact from Cash Flow Hedges $ 21,134 $ 6,000 $ (7,561) $ 19,573
              
   Six Months Ended March 31, 2012
   Natural Regulated    
   Gas Transmission    
   Distribution and Storage Nonregulated Consolidated
   (In thousands)
              
Loss reclassified from AOCI into revenue            
 for effective portion of commodity contracts $ - $ - $ (32,823) $ (32,823)
Loss arising from ineffective portion of             
 commodity contracts    -   -   (668)   (668)
Total impact on revenue   -   -   (33,491)   (33,491)
Loss on settled Treasury lock agreements            
 reclassified from AOCI into interest expense   (1,004)   -   -   (1,004)
Total Impact from Cash Flow Hedges $ (1,004) $ - $ (33,491) $ (34,495)
              
   Six Months Ended March 31, 2011
   Natural Regulated    
   Gas Transmission    
   Distribution and Storage Nonregulated Consolidated
   (In thousands)
              
Loss reclassified from AOCI into revenue            
 for effective portion of commodity contracts $ - $ - $ (21,581) $ (21,581)
Loss arising from ineffective portion of             
 commodity contracts    -   -   (677)   (677)
Total impact on revenue   -   -   (22,258)   (22,258)
Loss on settled Treasury lock agreements            
 reclassified from AOCI into interest expense   (1,339)   -   -   (1,339)
Gain on unwinding of Treasury lock reclassified            
 from AOCI into miscellaneous income   21,803   6,000   -   27,803
Total Impact from Cash Flow Hedges $ 20,464 $ 6,000 $ (22,258) $ 4,206
Other comprehensive income from hedging table
  Three Months Ended Six Months Ended
  March 31 March 31
  2012 2011 2012 2011
  (In thousands)
             
Increase (decrease) in fair value:           
 Treasury lock agreements$ 15,079 $ 6,667 $ 13,676 $ 38,092
 Forward commodity contracts  (18,234)   (446)   (41,912)   1,211
Recognition of (gains) losses in earnings due to            
 settlements:           
 Treasury lock agreements  317   (17,094)   633   (16,672)
 Forward commodity contracts  12,919   4,471   20,022   13,164
Total other comprehensive income (loss) from           
 hedging, net of tax(1)$ 10,081 $ (6,402) $ (7,581) $ 35,795
Expected recognition in earnings of deferred losses in AOCI table
  Treasury    
  Lock Commodity  
  Agreements Contracts Total
  (In thousands)
          
Next twelve months $ (1,266) $ (32,130) $ (33,396)
Thereafter   10,284   (6,621)   3,663
Total(1) $ 9,018 $ (38,751) $ (29,733)