v2.4.0.6

Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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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