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Third-Party Production Prepayments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023	Dec. 30, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Percentage of brews and packages			68.00%	69.00%
Total third-party production prepayments	$ 18,000		$ 18,000		$ 33,600
Total prepaid amount	18,015		18,015		$ 33,581
Shortfall fees	600	$ 500	4,700	$ 4,600
Contractual shortfall fees			101,000
Expected shortfall fees	$ 41,000		$ 41,000

X

- Definition

Contractual shortfall fees.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of brews and packages.

+ References

No definition available.

+ Details

Name:	sam_PercentageOfBrewsAndPackages
Namespace Prefix:	sam_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Short Fall Fees

+ References

No definition available.

+ Details

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

X

- Definition

Shortfall fees expected to be incurred.

+ References

No definition available.

+ Details

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

X

- Definition

Third party production prepayments.

+ References

No definition available.

+ Details

Name:	sam_ThirdPartyProductionPrepayments
Namespace Prefix:	sam_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Sum of the carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant