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Related Party Transactions (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
USD ($)
Bcf
Mar. 31, 2015
USD ($)
Bcf
Mar. 31, 2016
USD ($)
Bcf
Mar. 31, 2015
USD ($)
Bcf
Sep. 30, 2015
USD ($)
Bcf
Related Party Transaction          
Related party costs incurred $ 3,798 $ 4,138 $ 5,978 $ 6,920  
Energy Services          
Related Party Transaction          
Revenue from related parties 12,854 46,227 $ 21,620 62,417  
Term of agreements (in years)     1 year    
Purchases from related party $ 14,912 $ 49,750 $ 23,104 $ 71,525  
Energy Services | Inventories          
Related Party Transaction          
Volume of gas storage inventory (in bcf of natural gas) | Bcf 0.9 0.9 0.9 0.9 5.0
Natural gas storage inventory, related parties, current $ 2,074 $ 3,391 $ 2,074 $ 3,391 $ 12,889
Energy Services | SCAAs          
Related Party Transaction          
SCAA contract term (in years)     3 years    
Related party costs incurred 159 251 $ 2,029 5,207  
Energy Services | SCAAs | Other Current Liabilities          
Related Party Transaction          
Related party security deposits 8,100 10,700 8,100 10,700 $ 10,700
Energy Services | Exclusive of Transactions Pursuant SCAAs          
Related Party Transaction          
Related party costs incurred $ 31,691 $ 19,286 $ 59,055 $ 43,033