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Net Earnings per Common Share - Additional Informations (Detail) (Class A nonvoting common stock) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Class A nonvoting common stock
Earnings Per Share [Line Items]
Common stock of Class A shares excluded from computations of diluted net income per share	2,836	4,213	3,531	3,085

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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