v2.4.0.6

Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jul. 28, 2012
Schedule of Available-for-sale Securities [Line Items] |
Proceeds from the sale of the investment portfolio | $ 240
Realized gain on the sale of investment | 1
Available-for-sale investments - non-current | Auction rate securities |
Schedule of Available-for-sale Securities [Line Items] |
Non investment ARS remaining with book value | 2.7
Non investment ARS remaining with par value | 3.9
Available-for-sale investments, called for redemption | $ 11.7

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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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