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Marketable Securities - Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Feb. 10, 2018	Aug. 26, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	$ 118,610	$ 100,885
Available-For-Sale Marketable Securities, Gross Unrealized Gains		152
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(893)	(164)
Available-For-Sale Marketable Securities, Fair Value	117,717	100,873
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	65,261	39,917
Available-For-Sale Marketable Securities, Gross Unrealized Gains		73
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(533)	(13)
Available-For-Sale Marketable Securities, Fair Value	64,728	39,977
Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	22,996	31,076
Available-For-Sale Marketable Securities, Gross Unrealized Gains		49
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(129)	(74)
Available-For-Sale Marketable Securities, Fair Value	22,867	31,051
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	4,005	4,850
Available-For-Sale Marketable Securities, Gross Unrealized Gains		2
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(79)	(42)
Available-For-Sale Marketable Securities, Fair Value	3,926	4,810
Asset-Backed Securities and Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Marketable Securities, Amortized Cost Basis	26,348	25,042
Available-For-Sale Marketable Securities, Gross Unrealized Gains		28
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(152)	(35)
Available-For-Sale Marketable Securities, Fair Value	$ 26,196	$ 25,035

X

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

+ References

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=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-Publisher FASB
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-Topic 320
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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+ References

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-Publisher FASB
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-Topic 320
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+ References

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