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Network
157 - Disclosure - Reconciliation of Unrecognized Tax Benefits (Detail)
(http://www.bostonbeer.com/taxonomy/role/DisclosureReconciliationOfUnrecognizedTaxBenefits)
TableSchedule of Unrecognized Tax Benefits [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000949870 (http://www.sec.gov/CIK)
Legal EntityEntity [Domain]
Schedule of Unrecognized Tax Benefits [Line Items]Period [Axis]
2015-12-27 - 2016-12-31
2014-12-28 - 2015-12-26
Balance at beginning of year
486,000  
368,000  
Increases related to current year tax positions
80,000  
44,000  
Increases related to prior year tax positions
76,000  
117,000  
Decreases related to settlements
(50,000) 
 
Decreases related to lapse of statute of limitations
(3,000) 
(43,000) 
Balance at end of year
589,000  
 
486,000