Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Common Class A	Common Stock Common Class B	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income, net of tax	Retained Earnings
Balance at Dec. 31, 2016	$ 446,582	$ 92	$ 32	$ 349,913	$ (1,103)	$ 97,648
Balance (in shares) at Dec. 31, 2016		9,171,000	3,197,000
Net income	99,049					99,049
Stock options exercised and restricted shares activities (in shares)		217,000
Stock options exercised and restricted shares activities	16,363	$ 2		16,361
Stock-based compensation expense	$ 6,316			6,316
Repurchase of Class A Common Stock (in shares)	(963,790)	(964,000)
Repurchase of Class A Common Stock	$ (144,602)	$ (10)				(144,592)
Conversion from Class B to Class A (in shares)		179,000	(179,000)
Conversion from Class B to Class A		$ 2	$ (2)
Defined benefit plans liability adjustment, net of tax	(202)				(202)
Currency translation adjustment	17				17
Balance at Dec. 30, 2017	423,523	$ 86	$ 30	372,590	(1,288)	52,105
Balance (in shares) at Dec. 30, 2017		8,603,000	3,018,000
Net income	92,663					92,663
Stock options exercised and restricted shares activities (in shares)		227,000
Stock options exercised and restricted shares activities	23,088	$ 2		23,086
Stock-based compensation expense	$ 10,035			10,035
Repurchase of Class A Common Stock (in shares)	(349,691)	(350,000)
Repurchase of Class A Common Stock	$ (88,312)	$ (3)				(88,309)
Conversion from Class B to Class A (in shares)		100,000	(100,000)
Conversion from Class B to Class A		$ 1	$ (1)
Defined benefit plans liability adjustment, net of tax	277				277
Adoption of ASU 2014-09, Revenue from Contracts with Customers, tax adjustment	(1,000)
Currency translation adjustment	25				25
One time effect of adoption of ASU 2014-09, Revenue from Contracts with Customers, net of tax of $329	(982)					(982)
One time effect of adoption of ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income					(211)	211
Balance at Dec. 29, 2018	460,317	$ 86	$ 29	405,711	(1,197)	55,688
Balance (in shares) at Dec. 29, 2018		8,580,000	2,918,000
Net income	$ 110,041					110,041
Stock options exercised and restricted shares activities (in shares)	82,437	116,000
Stock options exercised and restricted shares activities	$ 8,999	$ 1		8,998
Stock-based compensation expense	12,337			12,337
Shares issued in connection with Dogfish Head merger (in shares)		430,000
Shares issued in connection with Dogfish Head merger	144,743	$ 5		144,738
Repurchase of Class A Common Stock (in shares)		245,000	(245,000)
Repurchase of Class A Common Stock		$ 2	$ (2)
Defined benefit plans liability adjustment, net of tax	(519)				(519)
Adoption of ASU 2014-09, Revenue from Contracts with Customers, tax adjustment	(329)					(329)
Currency translation adjustment	47				47
Balance at Dec. 28, 2019	$ 735,636	$ 94	$ 27	$ 571,784	$ (1,669)	$ 165,400
Balance (in shares) at Dec. 28, 2019		9,371,000	2,673,000