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Summary of Significant Accounting Policies (Details Textuals 1) - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Revenue, Major Customer [Line Items]      
Self Insured Claims Reserve $ 5.3 $ 5.3  
Sales Revenue, Net [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk, benchmark description more than 10 more than 10 more than 10
Concentration risk, customer No single customer accounted for more than 10 no single customer accounted for more than 10 no single customer accounted for more than 10
Accounts receivables      
Revenue, Major Customer [Line Items]      
Concentration risk, benchmark description more than 10 more than 10  
Concentration risk, customer no customer accounted for more than 10% one customer accounted for more than 10