Marketable Securities - Available-for-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2013	Aug. 25, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	$ 82,198	$ 75,673
Available-For-Sale Marketable Securities, Gross Unrealized Gains	240	561
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(277)	(20)
Available-For-Sale Marketable Securities, Fair Value	82,161	76,214
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	27,803	26,215
Available-For-Sale Marketable Securities, Gross Unrealized Gains	148	307
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(67)
Available-For-Sale Marketable Securities, Fair Value	27,884	26,522
Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	21,372	20,790
Available-For-Sale Marketable Securities, Gross Unrealized Gains	18	117
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(67)	(1)
Available-For-Sale Marketable Securities, Fair Value	21,323	20,906
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	7,198	4,369
Available-For-Sale Marketable Securities, Gross Unrealized Gains	24	17
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(138)	(19)
Available-For-Sale Marketable Securities, Fair Value	7,084	4,367
Asset-Backed Securities and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	25,825	24,299
Available-For-Sale Marketable Securities, Gross Unrealized Gains	50	120
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(5)
Available-For-Sale Marketable Securities, Fair Value	$ 25,870	$ 24,419