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Net Income per Common Share - Additional Informations (Detail) (Class A nonvoting common stock [Member])	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
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	2,505,000	5,072,000

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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