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Earnings Per Share (Details) - Schedule of weighted-average number of shares calculation of basic and diluted earnings per share - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Schedule of weighted-average number of shares calculation of basic and diluted earnings per share [Abstract]        
Basic weighted-average number of shares 12,633 10,229 12,412 10,212
Effect of dilutive securities:        
Stock options 698 371 472
Non-vested restricted Class B common stock 73 3 44
Deferred stock units 27 12 21
Diluted weighted-average number of shares 13,431 10,615 12,949 10,212