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Net Income per Common Share - Additional Informations (Detail)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Earnings Per Share [Line Items]
Basic (in shares)	51,866,000	51,330,000	52,453,000
Class A nonvoting common stock [Member]
Earnings Per Share [Line Items]
Common stock of Class A shares excluded from computations of diluted net income per share			4,592,486

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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