Marketable Securities - Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Aug. 27, 2016	Aug. 29, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	$ 98,166	$ 88,467
Available-For-Sale Marketable Securities, Gross Unrealized Gains	266	108
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(81)	(148)
Available-For-Sale Marketable Securities, Fair Value	98,351	88,427
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	37,789	34,859
Available-For-Sale Marketable Securities, Gross Unrealized Gains	198	51
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(6)	(40)
Available-For-Sale Marketable Securities, Fair Value	37,981	34,870
Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	33,497	33,098
Available-For-Sale Marketable Securities, Gross Unrealized Gains	24	31
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(35)	(7)
Available-For-Sale Marketable Securities, Fair Value	33,486	33,122
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	6,865	9,287
Available-For-Sale Marketable Securities, Gross Unrealized Gains	18	17
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(29)	(99)
Available-For-Sale Marketable Securities, Fair Value	6,854	9,205
Asset-Backed Securities and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	20,015	11,223
Available-For-Sale Marketable Securities, Gross Unrealized Gains	26	9
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(11)	(2)
Available-For-Sale Marketable Securities, Fair Value	$ 20,030	$ 11,230

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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