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Related Party Transactions (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Bcf
Jun. 30, 2014
USD ($)
Bcf
Jun. 30, 2015
USD ($)
Bcf
Jun. 30, 2014
USD ($)
Bcf
Sep. 30, 2014
USD ($)
Bcf
Related Party Transaction          
Related party costs incurred $ 2,647 $ 2,385 $ 9,567 $ 7,997  
Energy Services          
Related Party Transaction          
Revenue from related parties 9,129 9,869 $ 71,546 102,118  
Term of agreements     1 year    
Purchases from related party $ 8,431 $ 22,114 $ 79,956 $ 114,811  
Inventories | Energy Services          
Related Party Transaction          
Volume of gas storage inventory (in bcf of natural gas) | Bcf 2.6 4.0 2.6 4.0 7.7
Natural gas storage inventory, related parties, current $ 6,809 $ 19,410 $ 6,809 $ 19,410 $ 33,057
SCAAs | Energy Services          
Related Party Transaction          
SCAA contract term (in years)     3 years    
Related party costs incurred 5,691 16,894 $ 10,898 23,590  
SCAAs | Other Current Liabilities | Energy Services          
Related Party Transaction          
Related party security deposits 10,700 10,600 10,700 10,600 $ 10,600
Exclusive of Transactions Pursuant SCAAs | Energy Services          
Related Party Transaction          
Related party costs incurred $ 2,380 $ 1,551 $ 45,413 $ 34,259