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Interest Income for Distributor Notes Receivable (Detail) - USD ($) $ in Thousands | 4 Months Ended
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Apr. 21, 2018 | Apr. 22, 2017
Fair Value Disclosures [Abstract] |  |
Interest income | $ 8,095 | $ 6,577

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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