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Related Party Transactions (Details)
$ in Thousands
12 Months Ended
Nov. 01, 2015
Sep. 30, 2015
USD ($)
agreement
Bcf
Sep. 30, 2014
USD ($)
Bcf
Sep. 30, 2013
USD ($)
Sep. 30, 2011
USD ($)
Related Party Transaction          
Related party costs incurred   $ 11,956 $ 10,671 $ 8,366  
UGI Energy Services, Inc          
Related Party Transaction          
Agreement term (in years)   1 year      
Revenue from related parties   $ 79,182 109,913   $ 69,087
Purchases from related party   $ 85,383 128,076   77,017
SCAAs | UGI Energy Services, Inc          
Related Party Transaction          
Number of storage agreements | agreement   2      
Related party costs incurred   $ 16,849 38,299   45,843
Exclusive of Transactions Pursuant SCAAs | UGI Energy Services, Inc          
Related Party Transaction          
Related party costs incurred   47,794 35,810   $ 32,526
Other Current Liabilities | SCAAs | UGI Energy Services, Inc          
Related Party Transaction          
Related party security deposits   $ 10,700 $ 10,600    
Inventories | UGI Energy Services, Inc          
Related Party Transaction          
Volume of gas storage inventory (in bcf of natural gas) | Bcf   5.0 7.7    
Natural gas storage inventory, related parties, current   $ 12,889 $ 33,057    
Subsequent Event | SCAAs | UGI Energy Services, Inc          
Related Party Transaction          
Agreement term (in years) 3 years