Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Jul. 27, 2013 Rating D	Jul. 28, 2012	Jul. 30, 2011
Summary Of Significant Accounting Policies [Line Items]
Average lease term	4 years
Loan receivables, term	3 years
Investment Credit Risk Ratings Range Lowest	1
Investment Credit Risk Ratings Range Highest	10
Rating at or higher when receivables deemed impaired	8
Threshold for past due receivables	31 days
Threshold for not accruing interest	90 days
Channel partners revolving short-term financing payment term, minimum (days)	60
Channel partners revolving short-term financing payment term, maximum (days)	90
End User Lease And Loan Term Maximum	3 years
Depreciation And Amortization Expense Property And Equipment	$ 1,200,000,000	$ 1,100,000,000	$ 1,100,000,000
Advertising costs	$ 218,000,000	$ 218,000,000	$ 325,000,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Financed service contracts, term	1 year
Purchased intangible assets, estimated useful lives, years, minimum	2 years
Period for recognition of technical support services revenue, in years	1
Maximum
Summary Of Significant Accounting Policies [Line Items]
Financed service contracts, term	3 years
Purchased intangible assets, estimated useful lives, years, minimum	7 years
Period for recognition of technical support services revenue, in years	3