Marketable Securities - Available-for-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 09, 2013	Aug. 25, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	$ 81,749	$ 75,673
Available-For-Sale Marketable Securities, Gross Unrealized Gains	491	561
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(37)	(20)
Available-For-Sale Marketable Securities, Fair Value	82,203	76,214
Corporate securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	29,624	26,215
Available-For-Sale Marketable Securities, Gross Unrealized Gains	290	307
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(3)
Available-For-Sale Marketable Securities, Fair Value	29,911	26,522
Government bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	21,575	20,790
Available-For-Sale Marketable Securities, Gross Unrealized Gains	58	117
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(1)	(1)
Available-For-Sale Marketable Securities, Fair Value	21,632	20,906
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	8,453	4,369
Available-For-Sale Marketable Securities, Gross Unrealized Gains	23	17
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(33)	(19)
Available-For-Sale Marketable Securities, Fair Value	8,443	4,367
Asset-backed securities and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	22,097	24,299
Available-For-Sale Marketable Securities, Gross Unrealized Gains	120	120
Available-For-Sale Marketable Securities, Fair Value	$ 22,217	$ 24,419

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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