Schedule of Difference Between Basic and Diluted EPS as Result of Outstanding Stock Options and Restricted Stock (Detail)	12 Months Ended
Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Summary Of Significant Accounting Policies [Line Items]
Weighted average shares outstanding for basic earnings per share	53,845,697	55,271,340	53,019,008
Stock options and unvested restricted stock	54,151	102,301	100,356
Weighted average shares outstanding assuming dilution	53,899,848	55,373,641	53,119,364

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References+ Details

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

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+ Details