Quarterly report pursuant to Section 13 or 15(d)

Income taxes (Detail)

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Income taxes (Detail)
3 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 1.70% (3.90%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes 34.00%