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Marketable Securities - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Aug. 26, 2017 USD ($) Securities | Aug. 27, 2016 USD ($)
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 | 51 |
Available-For-Sale Marketable Securities, Gross Unrealized Losses | $ 164 | $ 81
Marketable securities transferred | $ 85,400 | $ 61,800

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- Definition Amount transferred by the Company's insurance captive to a Trust Account for future obligations. + References No definition available. + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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