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Third-Party Production Prepayments (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Mar. 26, 2022	Sep. 30, 2023	Sep. 24, 2022	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Percentage of brews and packages				69.00%	64.00%
Third party contract termination costs			$ 4,800
Total third-party production prepayments	$ 39,200			$ 39,200		$ 61,300
Total prepaid amount	39,209			39,209		$ 61,339
Shortfall fees	500	$ 400		4,600	$ 400
Contractual shortfall fees				114,000
Expected shortfall fees	$ 39,000			$ 39,000

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

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Namespace Prefix:	sam_
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Balance Type:	na
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X

- Definition

Short Fall 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

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 contract termination costs.

+ References

No definition available.

+ Details

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

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

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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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Balance Type:	debit
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