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Marketable Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 25, 2012 Security
Marketable Securities [Line Items]
Available for sale securities debt maturity period range	Less than one year to approximately 3 years
Number of securities held in unrealized loss position	6
Held to maturity securities in continuous unrealized loss position amount	$ 20

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity.

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- Definition

Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired.

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