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Goodwill and Intangible Assets (Table)
12 Months Ended
Sep. 30, 2011
Goodwill And Intangible Assets Note Tables Abstract 
Schedule of intangible assets and goodwill
 September 30
 2011 2010
  (In thousands)
      
Goodwill$ 740,000 $ 739,314
Intangible assets  207   834
      
Total$ 740,207 $ 740,148
Schedule of goodwill
 Natural Regulated      
 Gas Transmission      
 Distribution and Storage Nonregulated Total
 (In thousands)
            
Balance as of September 30, 2010$ 572,262 $ 132,341 $ 34,711 $ 739,314
Deferred tax adjustments on prior acquisitions(1)  646   40   -   686
Balance as of September 30, 2011$ 572,908 $ 132,381 $ 34,711 $ 740,000
Schedule of finite-lived intangible assets
                    
   September 30, 2011 September 30, 2010
 Useful Life (Years)  Gross Carrying Amount  Accumulated Amortization  Net  Gross Carrying Amount  Accumulated Amortization  Net
   (In thousands)
                    
Customer contracts10 $ 6,926 $ (6,719) $ 207 $ 6,926 $ (6,092) $ 834
Schedule of amortization expense of intangible assets
Amortization expense (in thousands):  
Actual for the fiscal year ending September 30, 2011$ 627
Estimated for the fiscal year ending:  
    September 30, 2012$ 43
    September 30, 2013  43
    September 30, 2014  43
    September 30, 2015  43
    September 30, 2016  35