Earnings (Loss) Per Share (Details 1) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Shares were excluded from the diluted earnings per share computations
Shares excluded from the calculation of diluted earnings per share	1,190	1,263	1,710	1,263
Stock options [Member]
Shares were excluded from the diluted earnings per share computations
Shares excluded from the calculation of diluted earnings per share	1,190	1,243	1,190	1,243
Non-vested restricted Class B common stock [Member]
Shares were excluded from the diluted earnings per share computations
Shares excluded from the calculation of diluted earnings per share		20	520	20