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	65,475			65,536			(61)
Other comprehensive income (loss)	(18,576)				(19,064)		488
Cash dividends declared	(19,223)			(19,223)
Dividends to noncontrolling interests	(5,642)						(5,642)
Purchase of noncontrolling interest	(50,111)			(30,661)			(19,450)
Addition of noncontrolling interest	5,125						5,125
Purchase of treasury shares, shares acquired	(20,481)					(20,481)
Stock plan exercises, shares acquired	(5)					(5)
Stock options exercised	724		(5,217)	5,462		479
Stock option expense	1,223		1,223
Stock awards	4,448		3,994			454
Ending balance at Jun. 27, 2020	1,152,702	27,900	0	2,194,916	(332,486)	(763,495)	25,867
Beginning balance at Mar. 28, 2020	1,110,130	27,900	0	2,171,329	(347,868)	(763,950)	22,719
Increase (Decrease) in Shareholders' Equity
Net earnings	22,754			22,607			147
Other comprehensive income (loss)	15,365				15,382		(17)
Cash dividends declared	(9,598)			(9,598)
Dividends to noncontrolling interests	(300)						(300)
Purchase of noncontrolling interest	7,818			8,025			(207)
Addition of noncontrolling interest	3,525						3,525
Stock plan exercises, shares acquired	(2)					(2)
Stock options exercised	664		(2,206)	2,553		317
Stock option expense	612		612
Stock awards	1,734		1,594			140
Ending balance at Jun. 27, 2020	1,152,702	27,900	0	2,194,916	(332,486)	(763,495)	25,867
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	117,658			117,124			534
Other comprehensive income (loss)	26,904				26,351		553
Cash dividends declared	(21,231)			(21,231)
Purchase of treasury shares, shares acquired	(21,600)					(21,600)
Stock plan exercises, shares acquired	(16,922)					(16,922)
Stock options exercised	19,891		(8,100)	(3,913)		31,904
Stock option expense	1,267		1,267
Stock awards	7,681		6,498			1,183
Ending balance at Jun. 26, 2021	1,321,484	27,900	0	2,337,015	(283,435)	(786,857)	26,861
Beginning balance at Mar. 27, 2021	1,250,102	27,900	0	2,282,355	(307,556)	(777,885)	25,288
Increase (Decrease) in Shareholders' Equity
Net earnings	62,657			62,110			547
Other comprehensive income (loss)	25,147				24,121		1,026
Cash dividends declared	(10,606)			(10,606)
Purchase of treasury shares, shares acquired	(10,469)					(10,469)
Stock plan exercises, shares acquired	(197)					(197)
Stock options exercised	573		(3,500)	3,156		917
Stock option expense	619		619
Stock awards	3,658		2,881			777
Ending balance at Jun. 26, 2021	$ 1,321,484	$ 27,900	$ 0	$ 2,337,015	$ (283,435)	$ (786,857)	$ 26,861