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Fair Value Measurements (Table)
9 Months Ended
Jun. 30, 2011
Fair Value Measurements Tables Abstract  
Fair value measurements table
   Quoted Significant Significant    
   Prices in Other Other    
   Active Observable Unobservable Netting and  
   Markets Inputs Inputs Cash June 30,
   (Level 1) (Level 2)(1) (Level 3) Collateral(2) 2011
    (In thousands)
                 
Assets:               
Financial instruments               
 Natural gas distribution segment $ - $ 2,739 $ - $ - $ 2,739
 Nonregulated segment   3,696   34,367   -   (25,006)   13,057
Total financial instruments   3,696   37,106   -   (25,006)   15,796
                 
Hedged portion of gas stored               
 underground   86,544   -   -   -   86,544
Available-for-sale securities   44,045   -   -   -   44,045
Total assets  $ 134,285 $ 37,106 $ - $ (25,006) $ 146,385
                 
Liabilities:               
Financial instruments               
 Natural gas distribution segment $ - $ 5,263 $ - $ - $ 5,263
 Nonregulated segment   10,645   38,827   -   (40,388)   9,084
Total liabilities $ 10,645 $ 44,090 $ - $ (40,388) $ 14,347

   Quoted Significant Significant    
   Prices in Other Other    
   Active Observable Unobservable Netting and  
   Markets Inputs Inputs Cash September 30,
   (Level 1) (Level 2)(1) (Level 3) Collateral(3) 2010
    (In thousands)
                 
Assets:               
Financial instruments               
 Natural gas distribution segment $ - $ 2,266 $ - $ - $ 2,266
 Nonregulated segment   18,544   42,462   -   (41,760)   19,246
Total financial instruments   18,544   44,728   -   (41,760)   21,512
                 
Hedged portion of gas stored               
 underground   57,507   -   -   -   57,507
Available-for-sale securities   41,466   -   -   -   41,466
Total assets  $ 117,517 $ 44,728 $ - $ (41,760) $ 120,485
                 
Liabilities:               
Financial instruments               
 Natural gas distribution segment $ - $ 51,866 $ - $ - $ 51,866
 Nonregulated segment   41,430   31,950   -   (66,649)   6,731
Total liabilities $ 41,430 $ 83,816 $ - $ (66,649) $ 58,597
Other fair value measurements table
  June 30, 2011
  (In thousands)
    
Carrying Amount $ 2,212,630
Fair Value $ 2,474,064