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Net Income Per Share (Details Textuals)
3 Months Ended 6 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2012
Jan. 31, 2011
Earnings Per Share [Abstract]        
Antidilutive securities excluded from Computation of Earnings Per Share 1,155,000 1,575,097 1,133,215 3,962,032