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Earnings Per Common Share - Additional Information (Detail)	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Antidilutive stock options, unvested restricted stock and restricted stock units outstanding	106,959	280,681

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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