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Revenue Recognition - Schedule of Revenue Recorded as Reductions to Net Revenue or as Advertising, Promotional and Selling Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 27, 2025 | Sep. 28, 2024 | Sep. 27, 2025 | Sep. 28, 2024
Disaggregation of Revenue [Abstract] |  |  |  |
Amount recorded as a reduction to net revenue | $ 11,930 | $ 9,109 | $ 30,876 | $ 22,823
Amount recorded as advertising, promotional and selling expenses | 6,519 | 5,277 | 15,608 | 14,537
Total customer programs and incentives | $ 18,449 | $ 14,386 | $ 46,484 | $ 37,360

X
- Definition Amount recorded as a reduction to net revenue. + References No definition available. + Details
Name: | sam_AmountRecordedAsAReductionToNetRevenue
Namespace Prefix: | sam_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount recorded as advertising, promotional and selling expenses. + References No definition available. + Details
Name: | sam_AmountRecordedAsAdvertisingPromotionalAndSellingExpenses
Namespace Prefix: | sam_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total customer programs and incentives. + References No definition available. + Details
Name: | sam_TotalCustomerProgramsAndIncentives
Namespace Prefix: | sam_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration