Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance, at Dec. 28, 2019	$ 9,949	$ 1,198,173	$ 1,480	$ (150,857)	$ 1,058,745
Balance, shares at Dec. 28, 2019	33,047,807			6,149,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		99,497			99,497
Other comprehensive income (loss), net of tax			1,479		1,479
Dividends paid		(25,016)			(25,016)
Balance, at Sep. 26, 2020	$ 9,949	1,272,655	2,959	$ (150,857)	1,134,706
Balance, shares at Sep. 26, 2020	33,047,807			6,149,364
Balance, at Jun. 27, 2020	$ 9,949	1,249,657	2,598	$ (150,857)	1,111,347
Balance, shares at Jun. 27, 2020	33,047,807			6,149,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		31,336			31,336
Other comprehensive income (loss), net of tax			362		362
Dividends paid		(8,339)			(8,339)
Balance, at Sep. 26, 2020	$ 9,949	1,272,655	2,959	$ (150,857)	1,134,706
Balance, shares at Sep. 26, 2020	33,047,807			6,149,364
Balance, at Dec. 26, 2020	$ 9,949	1,283,737	3,286	$ (150,857)	1,146,115
Balance, shares at Dec. 26, 2020	33,047,807			6,149,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		86,234			86,234
Other comprehensive income (loss), net of tax			(683)		(683)
Dividends paid		(25,016)			(25,016)
Balance, at Sep. 25, 2021	$ 9,949	1,344,956	2,603	$ (150,857)	1,206,651
Balance, shares at Sep. 25, 2021	33,047,807			6,149,364
Balance, at Jun. 26, 2021	$ 9,949	1,324,787	2,706	$ (150,857)	1,186,585
Balance, shares at Jun. 26, 2021	33,047,807			6,149,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		28,507			28,507
Other comprehensive income (loss), net of tax			(103)		(103)
Dividends paid		(8,339)			(8,339)
Balance, at Sep. 25, 2021	$ 9,949	$ 1,344,956	$ 2,603	$ (150,857)	$ 1,206,651
Balance, shares at Sep. 25, 2021	33,047,807			6,149,364