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Net Income per Share - Computation of Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 26, 2020 | Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Dec. 28, 2019 | [1] | Sep. 28, 2019 | [1] | Jun. 29, 2019 | [1] | Mar. 30, 2019 | [1] | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings to Common Shareholders, As reported - basic |  |  |  |  |  |  |  |  | $ 191,960 | $ 110,041 | $ 92,663
Common shares, As reported - basic |  |  |  |  |  |  |  |  | 12,204 | 11,886 | 11,733
EPS, As reported - basic | $ 2.68 | $ 6.61 | $ 4.93 | $ 1.50 | $ 1.13 | $ 3.70 | $ 2.39 | $ 2.04 | $ 15.73 | $ 9.26 | $ 7.90
Add: effect of dilutive potential common shares Share-based awards |  |  |  |  |  |  |  |  | 153 | 127 | 112
Earnings to Common Shareholders, Net effect of unvested participating shares |  |  |  |  |  |  |  |  | $ 14 | $ 10 | $ 8
Earnings to Common Shareholders, Net income per common share — diluted |  |  |  |  |  |  |  |  | $ 190,810 | $ 109,084 | $ 91,798
Common Shares, Net income per common share — diluted |  |  |  |  |  |  |  |  | 12,283 | 11,908 | 11,734
EPS, Net income per common share — diluted | $ 2.64 | $ 6.51 | $ 4.88 | $ 1.49 | $ 1.12 | $ 3.65 | $ 2.36 | $ 2.02 | $ 15.53 | $ 9.16 | $ 7.82
Common Class A |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings to Common Shareholders, As reported - basic |  |  |  |  |  |  |  |  | $ 153,106 | $ 82,474 | $ 68,080
Common shares, As reported - basic |  |  |  |  |  |  |  |  | 9,734 | 8,908 | 8,620
EPS, As reported - basic |  |  |  |  |  |  |  |  | $ 15.73 | $ 9.26 | $ 7.90
Common Class B |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings to Common Shareholders, As reported - basic |  |  |  |  |  |  |  |  | $ 37,690 | $ 26,600 | $ 23,710
Common shares, As reported - basic |  |  |  |  |  |  |  |  | 2,396 | 2,873 | 3,002
EPS, As reported - basic |  |  |  |  |  |  |  |  | $ 15.73 | $ 9.26 | $ 7.90
Earnings to Common Shareholders, Class B Common Stock |  |  |  |  |  |  |  |  | $ 37,690 | $ 26,600 | $ 23,710
Class B Common Stock |  |  |  |  |  |  |  |  | 2,396 | 2,873 | 3,002
[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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