Earnings (Loss) Per Share (Details) - Schedule of weighted-average number of shares used in the calculation of basic and diluted earnings (loss) 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 used in the calculation of basic and diluted earnings (loss) per share [Abstract]
Basic weighted-average number of shares	25,362	26,320	25,448	26,300
Effect of dilutive securities:
Stock options	9		4
Non-vested restricted Class B common stock	342	131	335
Diluted weighted-average number of shares	25,713	26,451	25,787	26,300