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Earnings Per Share (Details) - Schedule of shares excluded from the dilutive earnings per share computations - shares
shares in Thousands
3 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares excluded from the calculation of diluted earnings per share 951 1,475
Stock options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares excluded from the calculation of diluted earnings per share 917 1,231
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 34 154
Deferred stock units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Shares excluded from the calculation of diluted earnings per share 90