CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interest in consolidated subsidiaries
Beginning balance at Dec. 28, 2019	$ 1,189,745	$ 27,900	$ 0	$ 2,173,802	$ (313,422)	$ (743,942)	$ 45,407
Increase (Decrease) in Shareholders' Equity
Net earnings	42,721			42,929			(208)
Other comprehensive income (loss)	(33,941)				(34,446)		505
Cash dividends declared	(9,625)			(9,625)
Dividends to noncontrolling interests	(5,342)						(5,342)
Purchase of noncontrolling interest	(57,929)			(38,686)			(19,243)
Addition of noncontrolling interest	1,600						1,600
Purchase of treasury shares, shares acquired	(20,481)					(20,481)
Stock plan exercises, shares acquired	(3)					(3)
Stock options exercised	60		(3,011)	2,909		162
Stock option expense	611		611
Stock awards	2,714		2,400			314
Ending balance at Mar. 28, 2020	1,110,130	27,900	0	2,171,329	(347,868)	(763,950)	22,719
Beginning balance at Dec. 26, 2020	1,207,836	27,900	335	2,245,035	(309,786)	(781,422)	25,774
Increase (Decrease) in Shareholders' Equity
Net earnings	55,001			55,014			(13)
Other comprehensive income (loss)	1,757				2,230		(473)
Cash dividends declared	(10,625)			(10,625)
Purchase of treasury shares, shares acquired	(11,131)					(11,131)
Stock plan exercises, shares acquired	(16,725)					(16,725)
Stock options exercised	19,318		(4,600)	(7,069)		30,987
Stock option expense	648		648
Stock awards	4,023		3,617			406
Ending balance at Mar. 27, 2021	$ 1,250,102	$ 27,900	$ 0	$ 2,282,355	$ (307,556)	$ (777,885)	$ 25,288