Description of Business and Summary of Significant Accounting Policies (Details 1) - shares shares in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Summary of Weighted-Average Number of Shares used in Calculation of Basic and Diluted Earnings Per Share [Abstract]
Basic weighted-average number of shares	22,765	22,903	22,009
Effect of dilutive securities:
Stock options	6	23	92
Non-vested restricted Class B common stock	44	321	836
Diluted weighted-average number of shares	22,815	23,247	22,937