v2.4.0.6
Business Combination - Additional Information (Detail) (USD $)
12 Months Ended
Jul. 28, 2012
Jul. 30, 2011
Jul. 31, 2010
Business Acquisition [Line Items]      
Number of business combinations 7    
Total transaction costs related to business combination activities $ 15,000,000 $ 10,000,000 $ 32,000,000
Cash payment includes assumption of debt 5,000,000,000    
Repayments of Debt $ 1,000,000,000