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Schedule of Difference Between Basic and Diluted EPS as Result of Outstanding Stock Options and Unvested Restricted Stock and Restricted Stock Units (Detail)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Earnings Per Share Disclosure [Line Items]
Weighted average shares outstanding for basic earnings per share	53,005,576	53,845,697	55,271,340
Stock options and unvested restricted stock and restricted stock units	109,972	54,151	102,301
Weighted average shares outstanding assuming dilution	53,115,548	53,899,848	55,373,641

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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