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Energy Services Accounts Receivable Securitization Facility (Details) - USD ($)
 6 Months Ended
Oct. 31, 2016
Apr. 30, 2016
Mar. 31, 2016
Mar. 31, 2015
Energy Services        
Accounts, Notes, Loans and Financing Receivable        
Sale of trade receivables     $ 468,000,000 $ 692,000,000
Energy Services Funding Corporation        
Accounts, Notes, Loans and Financing Receivable        
Sale of undivided interests in its trade receivables to the commercial paper conduit     167,500,000 216,500,000
Outstanding balance of trade receivables     55,300,000 96,900,000
Outstanding balance of trade receivables sold     $ 4,000,000 $ 0
Forecast | Maximum        
Accounts, Notes, Loans and Financing Receivable        
Receivables facility $ 75,000,000 $ 150,000,000