v2.4.0.6

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Jul. 28, 2012 Year | Jul. 30, 2011 | Jul. 31, 2010
Summary Of Significant Accounting Policies [Line Items] |  |  |
Average lease term | 4 years |  |
Loan receivables, term | 3 years |  |
Depreciation And Amortization Expense Property And Equipment | $ 1,100,000,000 | $ 1,100,000,000 | $ 1,000,000,000
Purchased intangible assets, estimated useful lives, years, minimum | 2 |  |
Purchased intangible assets, estimated useful lives, years, maximum | 7 |  |
Advertising costs | $ 218,000,000 | $ 325,000,000 | $ 290,000,000
Risk Level, Low |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Internal credit risk rating | 1 |  |
Risk Level, High |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Internal credit risk rating | 10 |  |
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Financed service contracts, term | 1 year |  |
Revolving short-term financing, payment terms range (in days) | 60 |  |
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 |  |
Revolving short-term financing, payment terms range (in days) | 90 |  |
Period for recognition of technical support services revenue, in years | 3 |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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