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Earnings Per Share (Details 1) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from the calculation of diluted earnings per share 1,712 1,484 1,712 1,484
Stock options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from the calculation of diluted earnings per share 1,366 1,431 1,366 1,431
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 346 53 346 53