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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
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Dec. 26, 2020 USD ($) | Sep. 26, 2020 USD ($) | Jun. 27, 2020 USD ($) | Mar. 28, 2020 USD ($) | Dec. 28, 2019 USD ($) | Sep. 28, 2019 USD ($) | [1] | Jun. 29, 2019 USD ($) | [1] | Mar. 30, 2019 USD ($) | [1] | Dec. 26, 2020 USD ($) customer | Dec. 28, 2019 USD ($) customer | Dec. 29, 2018 USD ($) customer | Dec. 31, 2018
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  | $ 52,270,000 | $ 34,329,000 | $ 23,623,000 |
Net effect of COVID-19 on revenue, cost of goods sold and operating expense | $ 42,125,000 | $ 101,781,000 | $ 78,769,000 | $ 21,532,000 | $ 17,702,000 | [1] | $ 59,836,000 | $ 37,932,000 | $ 29,443,000 | $ 244,207,000 | $ 144,912,000 | $ 115,881,000 |
Sales to foreign distributors as a percentage of total sales | 4.00% |  |  |  | 4.00% |  |  |  |  | 4.00% | 4.00% | 4.00% | 4.00%
Number of individual customers represented more than ten percent of revenues | customer |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Number of individual customer accounted for more than ten percent of account receivable balance | customer |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Inventory on hand, purchase commitment | $ 285,000.0 |  |  |  |  |  |  |  |  | $ 285,000.0 |  |  |
Provision for excess or expired inventory |  |  |  |  |  |  |  |  |  | 11,300,000 | $ 8,100,000 | $ 4,200,000 |
Property, plant and equipment, net, excluding capital leased assets | 623,100,000 |  |  |  |  |  |  |  |  | 623,100,000 |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  | 4,466,000 | 911,000 | 652,000 |
Goodwill | 112,529,000 |  |  |  | $ 112,529,000 |  |  |  |  | 112,529,000 | 112,529,000 | $ 3,683,000 |
Intangible assets | 103,930,000 |  |  |  | 104,272,000 |  |  |  |  | 103,930,000 | 104,272,000 |  |
Decrease in refundable deposits for lost kegs and pallets |  |  |  |  |  |  |  |  |  | (400,000) | (800,000) |  |
Decrease in gross property, plant and equipment |  |  |  |  |  |  |  |  |  | (800,000) | (1,300,000) |  |
Decrease in property, plant and equipment related accumulated depreciation |  |  |  |  |  |  |  |  |  | (800,000) | (1,300,000) |  |
Refundable deposits on kegs and pallets | $ 15,500,000 |  |  |  | $ 19,500,000 |  |  |  |  | $ 15,500,000 | $ 19,500,000 |  |
Sales to domestic distributors as a percentage of total sales | 95.00% |  |  |  | 95.00% |  |  |  |  | 95.00% | 95.00% | 95.00% |
Sales to retail locations as a percentage of total sales | 1.00% |  |  |  | 1.00% |  |  |  |  | 1.00% | 1.00% | 1.00% |
Deferred Revenue, Current | $ 13,522,000 |  |  |  | $ 6,984,000 |  |  |  |  | $ 13,522,000 | $ 6,984,000 |  |
Stale Beer Reserve | 3,100,000 |  |  |  | 1,800,000 |  |  |  |  | 3,100,000 | 1,800,000 |  |
Provision for stale beer |  |  |  |  |  |  |  |  |  | 8,400,000 | 4,400,000 | $ 2,700,000 |
Advertising, promotional and selling expenses |  |  |  |  |  |  |  |  |  | 447,568,000 | 355,613,000 | 304,853,000 |
Advertising and sales promotional expenditures |  |  |  |  |  |  |  |  |  | 211,200,000 | 177,200,000 | 145,100,000 |
Reduction in federal excise taxes |  |  |  |  |  |  |  |  |  | 11,900,000 | 8,900,000 |  |
Shipping costs |  |  |  |  |  |  |  |  |  | 97,600,000 | 69,100,000 | 61,800,000 |
Stock-based compensation |  |  |  |  |  |  |  |  |  | 15,282,000 | 12,337,000 | 10,035,000 |
ASU 2017-04 |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment if fair value exceeds carrying amount |  |  |  |  |  |  |  |  |  | 0 |  |  |
Distributors |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts paid to distributors |  |  |  |  |  |  |  |  |  | 59,300,000 | 43,900,000 | 34,500,000 |
Advertising and sales promotional expenditures |  |  |  |  |  |  |  |  |  | 25,700,000 | 31,300,000 | 21,000,000.0 |
Reduction in revenue related to advertising, promotional and selling expenses |  |  |  |  |  |  |  |  |  | 23,100,000 | 21,600,000 | 13,900,000 |
Customers programs and incentives |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising, promotional and selling expenses |  |  |  |  |  |  |  |  |  | 85,000,000.0 | 75,200,000 | 55,500,000 |
Kegs |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net, excluding capital leased assets | 300,000 |  |  |  | 500,000 |  |  |  |  | 300,000 | 500,000 |  |
Boston Beer Company Reporting Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 112,500,000 |  |  |  | $ 112,500,000 |  |  |  |  | 112,500,000 | 112,500,000 |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  | $ 4,400,000 | $ 900,000 | $ 700,000 |
COVID-19 Pandemic |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Decreased percentage of shipments |  |  |  |  |  |  |  |  |  | 3.00% | 11.00% |  |
Net effect of COVID-19 on revenue, cost of goods sold and operating expense |  |  |  |  |  |  |  |  |  | $ 16,000,000.0 |  |  |
[1] | During the second, third and fourth quarter of 2019, the Company recorded $1.9 million, $5.9 million and $2.1 million in non-reoccurring transaction fees related to the Dogfish Head Transaction, respectively.

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