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Marketable Securities - Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Aug. 26, 2017 | Aug. 27, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-For-Sale Marketable Securities, Amortized Cost Basis | $ 100,885 | $ 98,166
Available-For-Sale Marketable Securities, Gross Unrealized Gains | 152 | 266
Available-For-Sale Marketable Securities, Gross Unrealized Losses | (164) | (81)
Available-For-Sale Marketable Securities, Fair Value | 100,873 | 98,351
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-For-Sale Marketable Securities, Amortized Cost Basis | 39,917 | 37,789
Available-For-Sale Marketable Securities, Gross Unrealized Gains | 73 | 198
Available-For-Sale Marketable Securities, Gross Unrealized Losses | (13) | (6)
Available-For-Sale Marketable Securities, Fair Value | 39,977 | 37,981
Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-For-Sale Marketable Securities, Amortized Cost Basis | 31,076 | 33,497
Available-For-Sale Marketable Securities, Gross Unrealized Gains | 49 | 24
Available-For-Sale Marketable Securities, Gross Unrealized Losses | (74) | (35)
Available-For-Sale Marketable Securities, Fair Value | 31,051 | 33,486
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-For-Sale Marketable Securities, Amortized Cost Basis | 4,850 | 6,865
Available-For-Sale Marketable Securities, Gross Unrealized Gains | 2 | 18
Available-For-Sale Marketable Securities, Gross Unrealized Losses | (42) | (29)
Available-For-Sale Marketable Securities, Fair Value | 4,810 | 6,854
Asset-Backed Securities and Other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-For-Sale Marketable Securities, Amortized Cost Basis | 25,042 | 20,015
Available-For-Sale Marketable Securities, Gross Unrealized Gains | 28 | 26
Available-For-Sale Marketable Securities, Gross Unrealized Losses | (35) | (11)
Available-For-Sale Marketable Securities, Fair Value | $ 25,035 | $ 20,030

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- Definition 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 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&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=82896770&loc=d3e26610-111562 + Details
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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://www.xbrl.org/2003/role/presentationRef -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 + Details
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