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Earnings Per Common Share - Additional Information (Detail)	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock options, unvested restricted stock and restricted stock units outstanding	39,523	106,959

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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