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Related Party Transactions - Additional Information (Detail) (China based Affiliate, USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Jul. 25, 2011
Jul. 31, 2012
Jul. 31, 2006
Jul. 25, 2011
China based Affiliate
       
Related Party Transaction [Line Items]        
Percentage of interest in affiliate sold 25.00%      
Value of interest in affiliate       $ 2.5
Book value of interest in affiliate written down     0  
(Loss) Gain on sale of other investments   $ 2.5