CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Earnings	Noncontrolling Interest	Total
Beginning balance at Dec. 30, 2017	$ 61,192	$ 161,928	$ 736,212	$ 144	$ 14,547	$ 974,023
Increase (Decrease) in Stockholders' Equity
Net earnings			32,833		749	33,582
Foreign currency translation adjustment				(785)	845	60
Unrealized gain (loss) on investment & foreign currency				(499)		(499)
Distributions to noncontrolling interest					(775)	(775)
Issuance of shares under employee stock purchase plans	8	199				207
Issuance of shares under stock grant programs	253	5,292				5,545
Issuance of shares under deferred compensation plans	117	(117)
Repurchase of shares	(26)		(822)			(848)
Expense associated with share-based compensation arrangements		1,034				1,034
Accrued expense under deferred compensation plans		4,593				4,593
Ending balance at Mar. 31, 2018	61,544	172,929	768,223	(1,140)	15,366	1,016,922
Beginning balance at Dec. 29, 2018	60,884	178,540	839,917	(5,938)	15,281	1,088,684
Increase (Decrease) in Stockholders' Equity
Net earnings			35,540		462	36,002
Foreign currency translation adjustment				982	224	1,206
Unrealized gain (loss) on investment & foreign currency				167		167
Distributions to noncontrolling interest					(500)	(500)
Issuance of shares under employee stock purchase plans	10	251				261
Issuance of shares under stock grant programs	320	6,101				6,421
Issuance of shares under deferred compensation plans	138	(138)
Expense associated with share-based compensation arrangements		1,226				1,226
Accrued expense under deferred compensation plans		4,899				4,899
Ending balance at Mar. 30, 2019	$ 61,352	$ 190,879	$ 875,457	$ (4,789)	$ 15,467	$ 1,138,366