Third-Party Production Prepayments - Schedule of Expected Shortfall Fees to be Incurred (Detail) $ in Millions	Mar. 26, 2022 USD ($)
Contractual Obligation, Fiscal Year Maturity [Abstract]
Remainder of 2022	$ 6
2023	16
2024	12
2025	6
Total shortfall fees expected to be incurred	$ 40

Shortfall fees expected to be incurred remainder of fiscal year.

No definition available.

Name:	sam_ShortfallFeesExpectedToBeIncurredRemainderOfFiscalYear
Namespace Prefix:	sam_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant