Computation of Earnings Per Share, Basic (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 28, 2019	[1]	Sep. 28, 2019	[1]	Jun. 29, 2019	[1]	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	[2]	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 13,762		$ 44,729		$ 27,856		$ 23,694	$ 21,811	$ 38,007		$ 23,535	$ 9,310	$ 110,041	$ 92,663	$ 99,049
Allocation of net income for basic:
Allocation of net income for basic common stock													$ 110,041	$ 92,663	$ 99,049
Weighted average number of shares for basic:
Weighted-average number of common shares — basic													11,886	11,733	12,102
Net income per share for basic:
Net income per common share — basic	$ 1.13		$ 3.70		$ 2.39		$ 2.04	$ 1.88	$ 3.25		$ 1.99	$ 0.79	$ 9.26	$ 7.90	$ 8.18
Common Class A
Allocation of net income for basic:
Allocation of net income for basic common stock													$ 82,474	$ 68,080	$ 73,114
Weighted average number of shares for basic:
Weighted-average number of common shares — basic													8,908	8,620	8,933
Net income per share for basic:
Net income per common share — basic													$ 9.26	$ 7.90	$ 8.18
Common Class B
Allocation of net income for basic:
Allocation of net income for basic common stock													$ 26,600	$ 23,710	$ 25,391
Weighted average number of shares for basic:
Weighted-average number of common shares — basic													2,873	3,002	3,102
Net income per share for basic:
Net income per common share — basic													$ 9.26	$ 7.90	$ 8.18
Unvested participating shares
Allocation of net income for basic:
Allocation of net income for basic unvested participating shares													$ 967	$ 873	$ 544
Weighted average number of shares for basic:
Weighted-average number of common shares — basic													105	111	67

[1] During the second, third and forth quarter of 2019, the Company recorded $X million, $X million and $X million in non-reoccurring transaction fees related to the Dogfish Head Transaction, respectively.

[2] During the third quarter of 2018, the Company recorded a $4.5 million tax benefit related to tax accounting method changes.