Annual report pursuant to Section 13 and 15(d)

Stockholders' equity (Detail) - Stock options outstanding

v2.4.0.6
Stockholders' equity (Detail) - Stock options outstanding (USD $)
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Shares 736,490 785,124 1,132,450
Weighted Average Exercise price (in Dollars per share) $ 14.50 $ 14.53 $ 14.30
Range of Exercise Prices 10.45 to 12.25 [Member]
     
Shares 355,874    
Weighted-Average Remaining Contractual Life in years 0.46    
Weighted Average Exercise price (in Dollars per share) $ 11.82    
Range of Exercise Prices 12.99 to 17.66 [Member]
     
Shares 380,616    
Weighted-Average Remaining Contractual Life in years 1.94    
Weighted Average Exercise price (in Dollars per share) $ 17.01