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Leases - Gross Value of Accumulated Depreciation Of Right Of Use Assets (Details). - USD ($) $ in Thousands | Jun. 27, 2020 | Dec. 28, 2019
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Finance Lease, Gross value | $ 6,694 | $ 2,837
Finance Lease, Accumulated amortization | (880) | (306)
Finance Lease, Carrying value | $ 5,814 | $ 2,531

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- Definition Accumulated Amortization Or Depreciation Finance Lease. + References No definition available. + Details
Name: | sam_AccumulatedAmortizationOrDepreciationFinanceLease
Namespace Prefix: | sam_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Finance lease right of use assets gross. + References No definition available. + Details
Name: | sam_FinanceLeaseRightOfUseAssetsGross
Namespace Prefix: | sam_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_FinanceLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant