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Summary of Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 1,800 |  |
Balance at End of Period | 3,100 | $ 1,800 |
Allowance for Doubtful Accounts |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 47 | 2 |
Net Provision (Recovery) | 488 | 45 | $ 2
Balance at End of Period | 535 | 47 | 2
Discount Accrual |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 6,272 | 4,636 | 3,072
Net Provision (Recovery) | 59,279 | 43,920 | 36,213
Amounts Charged Against Reserves | (56,194) | (42,284) | (34,649)
Balance at End of Period | 9,357 | 6,272 | 4,636
Inventory Obsolescence Reserve |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 6,375 | 2,580 | 1,826
Net Provision (Recovery) | 11,248 | 8,092 | 4,175
Amounts Charged Against Reserves | (11,292) | (4,297) | (3,421)
Balance at End of Period | 6,331 | 6,375 | 2,580
Stale Beer Reserve |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 1,828 | 2,146 | 3,023
Net Provision (Recovery) | 8,411 | 4,406 | 2,691
Amounts Charged Against Reserves | (7,147) | (4,724) | (3,568)
Balance at End of Period | $ 3,092 | $ 1,828 | $ 2,146

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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