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Quarterly Results (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 28, 2019 | Sep. 28, 2019 | Jun. 29, 2019
--- | --- | --- | ---
Dogfish Head Transaction [Member] |  |  |
Quarterly Financial Information [Line Items] |  |  |
Business combination non-reoccurring transaction fees | $ 2.1 | $ 5.9 | $ 1.9

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- Definition Quarterly Financial Information [Line Items] + References No definition available. + Details
Name: | sam_QuarterlyFinancialInformationLineItems
Namespace Prefix: | sam_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=sam_DogfishHeadTransactionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |