Earnings (Loss) Per Share (Details 1) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Shares were excluded from the diluted earnings per share computations
Shares excluded from the calculation of diluted earnings per share	1,223	1,444	1,236	1,444
Stock options [Member]
Shares were excluded from the diluted earnings per share computations
Shares excluded from the calculation of diluted earnings per share	1,223	1,253	1,236	1,253
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		191		191