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
	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.