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Financial Instruments (Table)
12 Months Ended
Sep. 30, 2012
Financial Instruments Note Tables [Abstract]  
Schedule of financial instrument assets and liabilities at fair value
       
 Natural Gas Distribution Nonregulated Total
  (In thousands)
September 30, 2012(3)      
       
Assets from risk management activities, current (1)$ 6,934$ 17,773$ 24,707
Assets from risk management activities, noncurrent  2,283  -  2,283
Liabilities from risk management activities, current (1)  (85,366)  (15)  (85,381)
Liabilities from risk management activities, noncurrent  -  (9,206)  (9,206)
Net assets (liabilities)$ (76,149)$ 8,552$ (67,597)
       
September 30, 2011(4)      
       
Assets from risk management activities, current (2)$ 843$ 17,501$ 18,344
Assets from risk management activities, noncurrent  998  -  998
Liabilities from risk management activities, current (2)  (11,916)  (3,537)  (15,453)
Liabilities from risk management activities, noncurrent  (67,862)  (10,227)  (78,089)
Net assets (liabilities)$ (77,937)$ 3,737$ (74,200)
       
Oustanding commodity contracts volumes table
Contract TypeHedge DesignationNatural Gas DistributionNonregulated
  Quantity (MMcf)
    
Commodity contractsFair Value - (22,650)
 Cash Flow - 35,300
 Not designated 24,185 49,155
   24,185 61,805
Financial instruments on the balance sheet
       Natural       
       Gas      
     Balance Sheet LocationDistribution Nonregulated Total
September 30, 2012   (In thousands)
               
Designated As Hedges:           
 Asset Financial Instruments        
  Current commodity contracts Other current assets$ - $ 19,301 $ 19,301
  Noncurrent commodity Deferred charges and        
   contracts  other assets  -   1,923   1,923
 Liability Financial Instruments        
  Current commodity contracts Other current liabilities  (85,040)   (23,787)   (108,827)
  Noncurrent commodity Deferred credits and        
   contracts  other liabilities  -   (4,999)   (4,999)
 Total      (85,040)   (7,562)   (92,602)
               
Not Designated As Hedges:        
 Asset Financial Instruments        
  Current commodity contracts Other current assets(1)  7,082   98,393   105,475
  Noncurrent commodity Deferred charges and        
   contracts  other assets  2,283   60,932   63,215
 Liability Financial Instruments        
  Current commodity contracts Other current liabilities(2)  (585)   (99,824)   (100,409)
  Noncurrent commodity Deferred credits and        
   contracts  other liabilities  -   (67,062)   (67,062)
 Total      8,780   (7,561)   1,219
Total Financial Instruments   $ (76,260) $ (15,123) $ (91,383)

       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
    Fiscal Year Ended September 30
   2012 2011 2010
    (In thousands)
           
Commodity contracts $ 30,266 $ 16,552 $ 34,650
Fair value adjustment for natural gas         
 inventory designated as the hedged item   (5,797)   9,824   19,867
Total impact on purchased gas cost $ 24,469 $ 26,376 $ 54,517
           
The impact on purchased gas cost is          
comprised of the following:         
     Basis ineffectiveness $ 1,170 $ 803 $ (1,272)
     Timing ineffectiveness   23,299   25,573   55,789
   $ 24,469 $ 26,376 $ 54,517
           
           
Cash flow hedges table
   Fiscal Year Ended September 30, 2012
   Natural Regulated    
   Gas Transmission    
   Distribution and Storage Nonregulated Consolidated
   (In thousands)
              
Loss reclassified from AOCI into purchased gas             
 cost for effective portion of commodity contracts $ - $ - $ (62,678) $ (62,678)
Loss arising from ineffective portion of             
 commodity contracts    -   -   (1,369)   (1,369)
Total impact on purchased gas cost   -   -   (64,047)   (64,047)
              
Net loss on settled Treasury lock agreements            
  reclassified from AOCI into interest expense   (2,009)   -   -   (2,009)
Total impact from cash flow hedges $ (2,009) $ - $ (64,047) $ (66,056)
              
   Fiscal Year Ended September 30, 2011
   Natural Regulated    
  Gas Transmission    
  Distribution and Storage Nonregulated Consolidated
   (In thousands)
              
Loss reclassified from AOCI into purchased gas             
 cost for effective portion of commodity contracts $ - $ - $ (28,430) $ (28,430)
Loss arising from ineffective portion of            
 commodity contracts    -   -   (1,585)   (1,585)
Total impact on purchased gas cost   -   -   (30,015)   (30,015)
              
Net loss on settled Treasury lock agreements            
 reclassified from AOCI into interest expense   (2,455)   -   -   (2,455)
Gain on unwinding of Treasury lock reclassified            
 from AOCI into miscellaneous income   21,803   6,000   -   27,803
Total impact from cash flow hedges $ 19,348 $ 6,000 $ (30,015) $ (4,667)
              
   Fiscal Year Ended September 30, 2010
   Natural Regulated    
  Gas Transmission    
  Distribution and Storage Nonregulated Consolidated
   (In thousands)
              
Loss reclassified from AOCI into purchased gas             
 cost for effective portion of commodity contracts $ - $ - $ (44,809) $ (44,809)
Loss arising from ineffective portion of             
 commodity contracts    -   -   (2,717)   (2,717)
Total impact on purchased gas cost   -   -   (47,526)   (47,526)
              
Net loss on settled Treasury lock agreements            
 reclassified from AOCI into interest expense   (2,678)   -   -   (2,678)
Total impact from cash flow hedges $ (2,678) $ - $ (47,526) $ (50,204)
Other comprehensive income from hedging table
  Fiscal Year Ended September 30
  2012 2011
  (In thousands)
Decrease in fair value:     
 Treasury lock agreements$ (11,458) $ (12,720)
 Forward commodity contracts  (30,366)   (12,096)
       
Recognition of (gains) losses in earnings due to settlements:     
 Treasury lock agreements  1,342   (15,969)
 Forward commodity contracts  38,232   17,344
Total other comprehensive loss from     
 hedging, net of tax (1)$ (2,250) $ (23,441)
Expected recognition in earnings of deferred losses in AOCI table
 Treasury      
 Lock Commodity   
 Agreements Contracts Total
 (In thousands)
         
2013$ (1,276) $ (7,171) $ (8,447)
2014  (1,276)   (1,908)   (3,184)
2015  606   10   616
2016  776   46   822
2017  675   28   703
Thereafter  10,222   -   10,222
Total(1)$ 9,727 $ (8,995) $ 732