Description of Business and Summary of Significant Accounting Policies - Summary of Weighted-Average Number of Shares used in Calculation of Basic and Diluted Earnings Per Share (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Summary of Weighted-Average Number of Shares used in Calculation of Basic and Diluted Earnings Per Share [Abstract]
Basic weighted-average number of shares	22,009	20,876	20,717
Stock options	92	9
Non-vested restricted Class B common stock	836	1,430	1,343
Diluted weighted-average number of shares	22,937	22,315	22,060