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Commitments and Contingencies - Summary of Non-cancelable Contractual Obligations (Detail) $ in Thousands | Sep. 26, 2020 USD ($)
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Long-term Purchase Commitment [Line Items] |
Contractual obligations | $ 279,581
Equipment and machinery |
Long-term Purchase Commitment [Line Items] |
Contractual obligations | 73,774
Ingredients |
Long-term Purchase Commitment [Line Items] |
Contractual obligations | 130,933
Brand Support |
Long-term Purchase Commitment [Line Items] |
Contractual obligations | 62,496
Other |
Long-term Purchase Commitment [Line Items] |
Contractual obligations | $ 12,378

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=sam_IngredientsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=sam_BrandSupportMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=sam_OtherPurchaseCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |