Marketable Securities - Available-for-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Nov. 23, 2013	Aug. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	$ 82,466	$ 82,198
Available-For-Sale Marketable Securities, Gross Unrealized Gains	381	240
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(86)	(277)
Available-For-Sale Marketable Securities, Fair Value	82,761	82,161
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	26,546	27,803
Available-For-Sale Marketable Securities, Gross Unrealized Gains	240	148
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(6)	(67)
Available-For-Sale Marketable Securities, Fair Value	26,780	27,884
Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	22,386	21,372
Available-For-Sale Marketable Securities, Gross Unrealized Gains	35	18
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(2)	(67)
Available-For-Sale Marketable Securities, Fair Value	22,419	21,323
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	6,767	7,198
Available-For-Sale Marketable Securities, Gross Unrealized Gains	32	24
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(78)	(138)
Available-For-Sale Marketable Securities, Fair Value	6,721	7,084
Asset-Backed Securities and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	26,767	25,825
Available-For-Sale Marketable Securities, Gross Unrealized Gains	74	50
Available-For-Sale Marketable Securities, Gross Unrealized Losses		(5)
Available-For-Sale Marketable Securities, Fair Value	$ 26,841	$ 25,870