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Description of Business and Summary of Significant Accounting Policies - Summary of Outstanding Stock Options Excluded from Calculation of Diluted Earnings Per Share (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Earnings Per Share [Abstract]
Shares excluded from the calculation of diluted earnings per share	70	611	619

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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