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Related Party Transactions (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2016
USD ($)
Bcf
Jun. 30, 2015
USD ($)
Bcf
Jun. 30, 2016
USD ($)
Bcf
Jun. 30, 2015
USD ($)
Bcf
Sep. 30, 2015
USD ($)
Bcf
Related Party Transaction          
Related party costs incurred $ 2,811 $ 2,647 $ 8,789 $ 9,567  
Energy Services          
Related Party Transaction          
Revenue from related parties 4,514 9,129 $ 26,134 71,546  
Term of agreements (in years)     1 year    
Purchases from related party $ 6,928 $ 8,431 $ 30,032 $ 79,956  
Energy Services | Inventories          
Related Party Transaction          
Volume of gas storage inventory (in bcf of natural gas) | Bcf 2.7 2.6 2.7 2.6 5.0
Natural gas storage inventory, related parties, current $ 5,100 $ 6,809 $ 5,100 $ 6,809 $ 12,889
Energy Services | SCAAs          
Related Party Transaction          
SCAA contract term (in years)     3 years    
Related party costs incurred 4,358 5,691 $ 6,387 10,898  
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 $ 2,138 $ 2,380 $ 61,193 $ 45,413