Annual report pursuant to Section 13 and 15(d)

Income taxes (Detail) - The benefit (provision) for income taxes were at rates different from U.S. federal statutory rates

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Income taxes (Detail) - The benefit (provision) for income taxes were at rates different from U.S. federal statutory rates
12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Federal statutory rate 34.00% 34.00% 34.00%
Expenses not deductible for income tax return purposes (0.50%) (2.30%) (1.50%)
State income taxes, net of (benefit) of federal tax deduction 0.90% 1.00% 0.10%
Change in valuation allowance (23.20%) (34.60%) (32.30%)
Impairment of goodwill (7.10%)    
Reversal of tax reserve   0.10% 0.50%
Other (0.10%) 0.70% (0.70%)
4.00% (1.10%) 0.10%