CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Earnings [Member]	Employee Stock Notes Receivable [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 29, 2012	$ 19,800	$ 149,805	$ 426,887	$ 4,258	$ (982)	$ 7,757	$ 607,525
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings			5,224			532	5,756
Foreign currency translation adjustment				119		296	415
Distributions to noncontrolling interest						(330)	(330)
Issuance of shares under employee stock plans	3	77					80
Issuance of shares under stock grant programs	33	(19)	5				19
Issuance of shares under deferred compensation plans	33	(33)					0
Tax benefits from non-qualified stock options exercised		7					7
Expense associated with share-based compensation arrangements		642					642
Accrued expense under deferred compensation plans		1,410					1,410
Payments received on employee stock notes receivable					133		133
Balance at Mar. 30, 2013	19,869	151,889	432,116	4,377	(849)	8,255	615,657
Balance at Dec. 28, 2013	19,948	156,129	461,812	3,466	(732)	9,111	649,734
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings			7,216			452	7,668
Foreign currency translation adjustment				(602)		(94)	(696)
Noncontrolling interest associated with business acquisitions						975	975
Distributions to noncontrolling interest						(701)	(701)
Issuance of shares under employee stock plans	2	97					99
Issuance of shares under stock grant programs	63	523					586
Issuance of shares under deferred compensation plans	36	(35)					1
Expense associated with share-based compensation arrangements		495					495
Accrued expense under deferred compensation plans		2,069					2,069
Payments received on employee stock notes receivable					192		192
Balance at Mar. 29, 2014	$ 20,049	$ 159,278	$ 469,028	$ 2,864	$ (540)	$ 9,743	$ 660,422