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Description of Business and Summary of Significant Accounting Policies (Details 1) - shares
shares in Thousands
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares excluded from the calculation of diluted earnings per share 1,491 355
Stock options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares excluded from the calculation of diluted earnings per share 1,438 355
Non-vested restricted Class B common stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares excluded from the calculation of diluted earnings per share 53