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Employee Retirement Plans and Post-Retirement Medical Benefits - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
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Jan. 31, 2020 | Dec. 25, 2021 USD ($) CompensationPlan | Dec. 26, 2020 USD ($) | Dec. 28, 2019 USD ($)
Pension Benefit Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Unfunded projected pension benefits |  |  | $ 0 |
Retiree Medical Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Unfunded projected pension benefits |  | $ (1,040,000) | (1,077,000) |
Non-Union Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Number of retirement plans | CompensationPlan |  | 1 |  |
Non-Union Plans | Boston Beer 401 (k) Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Eligibility timing |  | eligible to participate in the Plan immediately upon employment |  |
Voluntary contributions of annual compensation |  | 60.00% |  |
Employer matching contribution percentage |  | 5.00% |  |
Contributions Plan |  | $ 7,400,000 | 6,400,000 | $ 4,000,000.0
Non-Union Plans | Boston Beer 401 (k) Plan | Company's match thereafter |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employer matching contribution percentage | 3.00% |  |  |
Employer match percentage | 100.00% |  |  |
Non-Union Plans | Boston Beer 401 (k) Plan | Company's match for the first 3% of the eligible participants contribute |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employer matching contribution percentage | 5.00% |  |  |
Employer match percentage | 50.00% |  |  |
Non-Union Plans | Dogfish Head 401 (K) Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary contributions of annual compensation |  | 60.00% |  |
Employer matching contribution percentage |  | 5.00% |  |
Contributions Plan |  |  |  | 300,000
Non-Union Plans | Dogfish Head 401 (K) Plan | Company's match thereafter |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employer match percentage |  | 50.00% |  |
Non-Union Plans | Dogfish Head 401 (K) Plan | Company's match for the first 3% of the eligible participants contribute |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employer match percentage |  | 100.00% |  |
Contribution percentage by the company |  | 3.00% |  |
Union Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Number of retirement plans | CompensationPlan |  | 2 |  |
Union Plans | Company Sponsored Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Eligibility timing |  | open to all union employees who are covered by the Company’s collective bargaining agreement with Teamsters Local Union. No. 1199 (“Local Union 1199”), or persons on leave from the Company who are employed by Local Union 1199, and in either case who have completed 12 consecutive months of employment with at least 750 hours worked. |  |
Eligibility period |  | 12 months |  |
Time required for eligibility |  | 750 hours |  |
Expenses on termination of defined benefit plan |  |  | 2,000,000.0 |
Pension contributions |  |  | $ 2,900,000 | $ 300,000
Union Plans | Retiree Medical Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Eligibility period |  | 20 years |  |
Time required for eligibility |  | 5 years |  |
Benefit obligation, discount rate |  | 2.86% | 2.50% |
Benefit obligation, rate of compensation increase |  | 2.50% | 2.50% | 2.50%
Percentage paid for coverage |  | 100.00% |  |
Union Plans | Retiree Medical Plan | Minimum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntarily retirement age |  | 57 years |  |
Union Plans | Retiree Medical Plan | Local #20 member |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Time required for eligibility |  | 7 years |  |
Retiree Medical Plan, last years of employment |  | 10 years |  |
Voluntarily retirement age |  | 65 years |  |
Union Plans | Retiree Medical Plan | Local #20 member | Minimum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Eligibility period |  | 20 years |  |
Union Plans | Samuel Adams Cincinnati Brewery 401 (k) Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Eligibility timing |  | all union employees upon commencement of employment or, if later, attaining age 21. |  |
Voluntary contributions of annual compensation |  | 60.00% |  |

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