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Marketable Debt Securities - Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Feb. 09, 2019 | Aug. 25, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-For-Sale Marketable Securities, Amortized Cost Basis | $ 122,299 | $ 135,776
Available-For-Sale Marketable Securities, Gross Unrealized Gains | 97 |
Available-For-Sale Marketable Securities, Gross Unrealized Losses | (652) | (1,100)
Available-For-Sale Marketable Securities, Fair Value | 121,744 | 134,676
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-For-Sale Marketable Securities, Amortized Cost Basis | 42,817 | 50,306
Available-For-Sale Marketable Securities, Gross Unrealized Losses | (412) | (684)
Available-For-Sale Marketable Securities, Fair Value | 42,405 | 49,622
Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-For-Sale Marketable Securities, Amortized Cost Basis | 38,670 | 28,777
Available-For-Sale Marketable Securities, Gross Unrealized Gains | 97 |
Available-For-Sale Marketable Securities, Gross Unrealized Losses | (95) | (173)
Available-For-Sale Marketable Securities, Fair Value | 38,672 | 28,604
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-For-Sale Marketable Securities, Amortized Cost Basis | 2,635 | 3,248
Available-For-Sale Marketable Securities, Gross Unrealized Losses | (60) | (90)
Available-For-Sale Marketable Securities, Fair Value | 2,575 | 3,158
Asset-Backed Securities and Other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-For-Sale Marketable Securities, Amortized Cost Basis | 38,177 | 53,445
Available-For-Sale Marketable Securities, Gross Unrealized Losses | (85) | (153)
Available-For-Sale Marketable Securities, Fair Value | $ 38,092 | $ 53,292

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + 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://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 + Details
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- Definition 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 No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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