Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Items	Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock (in shares)					2,949,997
Common stock, beginning balance (in shares) at Dec. 31, 2022		14,624,159
Beginning balance at Dec. 31, 2022	$ 655,571	$ 146	$ 119,924	$ 660,644	$ (72,287)	$ (54,578)	$ 1,722
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	28,259			28,075			184
Dividend declared – Common Stock	(3,394)			(3,394)
Activity under stock plans (in shares)					(29,319)
Activity under stock plans	(1,659)		(2,377)		$ 718
Other comprehensive items	5,528					5,493	35
Common stock, ending balance (in shares) at Apr. 01, 2023		14,624,159
Treasury stock, ending balance (in shares) at Apr. 01, 2023					2,920,678
Ending balance at Apr. 01, 2023	$ 684,305	$ 146	117,547	685,325	$ (71,569)	(49,085)	1,941
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock (in shares)					2,920,678
Treasury stock (in shares)	2,915,978				2,915,978
Common stock, beginning balance (in shares) at Dec. 30, 2023		14,624,159
Beginning balance at Dec. 30, 2023	$ 776,240	$ 146	124,940	763,131	$ (71,453)	(43,062)	2,538
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,985			24,689			296
Dividend declared – Common Stock	(3,758)			(3,758)
Activity under stock plans (in shares)					(34,765)
Activity under stock plans	(1,835)		(2,687)		$ 852
Noncontrolling interests acquired (Note 2)	9,319						9,319
Other comprehensive items	$ (10,183)					(10,111)	(72)
Common stock, ending balance (in shares) at Mar. 30, 2024		14,624,159
Treasury stock, ending balance (in shares) at Mar. 30, 2024	2,881,213				2,881,213
Ending balance at Mar. 30, 2024	$ 794,768	$ 146	$ 122,253	$ 784,062	$ (70,601)	$ (53,173)	$ 12,081
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock (in shares)	2,881,213				2,881,213