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Marketable Securities - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Aug. 25, 2018 USD ($) Securities | Aug. 26, 2017 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |
Available for sale securities debt maturity period range | Less than one year to approximately three years |
Number of securities available for sale loss position | Securities | 121 |
Available-For-Sale Marketable Securities, Gross Unrealized Losses | $ 1,100 | $ 164
Marketable securities transferred | $ 85,600 | $ 85,400

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