Prepaid Expenses and Other Current Assets - Additional Information (Detail) $ in Millions	Mar. 27, 2021 USD ($)
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Reclassification of third-party prepayments from current assets to non-current assets	$ 14.8

Reclassification of prepaid expenses from current assets to non-current assets.

No definition available.

Name:	sam_ReclassificationOfPrepaidExpensesFromCurrentAssetsToNonCurrentAssets
Namespace Prefix:	sam_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration