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Marketable Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Feb. 09, 2013 Security
Marketable Securities [Line Items]
Available for sale securities debt maturity period range	Less than one year to approximately 3 years
Number of securities available for sale loss position	12
Available for sale securities in continuous unrealized loss position amount	$ 37

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) 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 available-for-sale investments determined to be temporarily impaired.

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