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Energy Services Accounts Receivable Securitization Facility (Details) - USD ($)
 3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Oct. 31, 2016
Apr. 30, 2016
Energy Services        
Accounts, Notes, Loans and Financing Receivable        
Sale of trade receivables $ 199,300,000 $ 286,400,000    
Energy Services Funding Corporation        
Accounts, Notes, Loans and Financing Receivable        
Sale of undivided interests in its trade receivables to the commercial paper conduit 61,500,000 105,000,000    
Outstanding balance of trade receivables 55,400,000 96,500,000    
Outstanding balance of trade receivables sold $ 26,000,000 $ 43,000,000    
Forecast | Maximum        
Accounts, Notes, Loans and Financing Receivable        
Receivables facility     $ 75,000,000 $ 150,000,000