Consolidated Statements of Equity (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 27, 2008	$ 217	$ 124,384		$ (10,123)	$ 219,230	$ 143	$ 333,851
Comprehensive income:
Net income for the year					9,411		9,411
Change in net unrealized gain on derivatives				311			311
Min. pension liability adj.				11,657			11,657
Unrealized gain or loss on invest.				8,648			8,648
Foreign currency trans. adj.				8,234			8,234
Comprehensive income							38,261
Stock-based compensation		5,503					5,503
Stock options exercised, including tax impact	1	983					984
Balance at Jan. 02, 2010	218	130,870		18,727	228,641	143	378,599
Comprehensive income:
Net income for the year					78,663		78,663
Change in net unrealized gain on derivatives				92			92
Min. pension liability adj.				(3,044)			(3,044)
Unrealized gain or loss on invest.				696			696
Foreign currency trans. adj.				4,770			4,770
Comprehensive income							81,177
Stock-based compensation		5,243					5,243
Withheld shares on restricted stock grants for withholding taxes			(422)				(422)
Purchase of common stock	(6)	(2,247)	(23,124)				(25,377)
Stock options exercised, including tax impact	6	16,682					16,688
Cash dividends paid					(3,248)		(3,248)
Balance at Jan. 01, 2011	218	150,548	(23,546)	21,241	304,056	143	452,660
Comprehensive income:
Net income for the year					87,024		87,024
Min. pension liability adj.				(6,703)			(6,703)
Unrealized gain or loss on invest.				(2,702)			(2,702)
Foreign currency trans. adj.				(3,205)			(3,205)
Comprehensive income							74,414
Stock-based compensation		5,805					5,805
Withheld shares on restricted stock grants for withholding taxes			(1,203)				(1,203)
Purchase of common stock	(9)	(2,998)	(34,085)				(37,092)
Stock options exercised, including tax impact	7	21,020					21,027
Cash dividends paid					(14,508)		(14,508)
Balance at Dec. 31, 2011	$ 216	$ 174,375	$ (58,834)	$ 8,631	$ 376,572	$ 143	$ 501,103