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Marketable Debt Securities - Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Nov. 17, 2018	Aug. 25, 2018
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	$ 130,140	$ 135,776
Available-For-Sale Marketable Securities, Gross Unrealized Gains	4
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(1,202)	(1,100)
Available-For-Sale Marketable Securities, Fair Value	128,942	134,676
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	46,378	50,306
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(751)	(684)
Available-For-Sale Marketable Securities, Fair Value	45,627	49,622
Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	30,376	28,777
Available-For-Sale Marketable Securities, Gross Unrealized Gains	4
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(219)	(173)
Available-For-Sale Marketable Securities, Fair Value	30,161	28,604
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	2,902	3,248
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(81)	(90)
Available-For-Sale Marketable Securities, Fair Value	2,821	3,158
Asset-Backed Securities and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	50,484	53,445
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(151)	(153)
Available-For-Sale Marketable Securities, Fair Value	$ 50,333	$ 53,292

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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