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Net Income per Share - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2020 customer $ / shares | Sep. 26, 2020 $ / shares | Jun. 27, 2020 $ / shares | Mar. 28, 2020 $ / shares | Dec. 28, 2019 $ / shares | [1] | Sep. 28, 2019 $ / shares | [1] | Jun. 29, 2019 $ / shares | [1] | Mar. 30, 2019 $ / shares | [1] | Dec. 26, 2020 customer $ / shares shares | Dec. 28, 2019 $ / shares shares | Dec. 29, 2018 $ / shares shares
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income per common share - basic | $ 2.68 | $ 6.61 | $ 4.93 | $ 1.50 | $ 1.13 | $ 3.70 | $ 2.39 | $ 2.04 | $ 15.73 | $ 9.26 | $ 7.90
Conversion ratio for Class B to Class A shares | customer | 1 |  |  |  |  |  |  |  | 1 |  |
Common Class A |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income per common share - basic |  |  |  |  |  |  |  |  | $ 15.73 | $ 9.26 | $ 7.90
Antidilutive securities excluded from computation of earnings per share | shares |  |  |  |  |  |  |  |  | 0 | 23,000 | 100,000
Common Class A | Performance-Based Awards |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares not included because the performance criteria was not expected to be met | shares |  |  |  |  |  |  |  |  |  | 10,000 | 10,000
Common Class B |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income per common share - basic |  |  |  |  |  |  |  |  | $ 15.73 | $ 9.26 | $ 7.90
[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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