CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(loss) [Member]
Balance, Beginning at Jan. 02, 2010	$ 342,655	$ 136	$ 162,001	$ (102,000)	$ 287,387	$ (4,869)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	72,867	0	0	0	72,867	0
Currency translation adjustments	599	0	0	0	0	599
Change in unrecognized pension benefit costs, net of tax of 2010: $105, 2011: $3,200, 2012: $(137)	(187)	0	0	0	0	(187)
Unrealized gain on interest rate swap, net of tax of 2010: $(342), 2011: $437, 2012: $(149)	423	0	0	0	0	423
Comprehensive income	73,702	0	0	0	72,867	835
Exercise of stock options	666	0	666	0	0	0
Stock issuance	1,777	1	1,776	0	0	0
Stock compensation	14,682	0	14,682	0	0	0
Tax benefit on stock compensation	450	0	450	0	0	0
Purchase of treasury stock	(9,019)	0	0	(9,019)	0	0
Balance, Ending at Jan. 01, 2011	424,913	137	179,575	(111,019)	360,254	(4,034)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	95,473	0	0	0	95,473	0
Currency translation adjustments	(10,769)	0	0	0	0	(10,769)
Change in unrecognized pension benefit costs, net of tax of 2010: $105, 2011: $3,200, 2012: $(137)	(5,145)	0	0	0	0	(5,145)
Unrealized gain on interest rate swap, net of tax of 2010: $(342), 2011: $437, 2012: $(149)	(586)	0	0	0	0	(586)
Comprehensive income	78,973	0	0	0	95,473	(16,500)
Exercise of stock options	224	0	224	0	0	0
Stock compensation	18,133	0	18,133	0	0	0
Tax benefit on stock compensation	4,389	0	4,389	0	0	0
Purchase of treasury stock	(15,663)	0	0	(15,663)	0	0
Balance, Ending at Dec. 31, 2011	510,969	137	202,321	(126,682)	455,727	(20,534)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	120,697	0	0	0	120,697	0
Currency translation adjustments	5,873	0	0	0	0	5,873
Change in unrecognized pension benefit costs, net of tax of 2010: $105, 2011: $3,200, 2012: $(137)	2,018	0	0	0	0	2,018
Unrealized gain on interest rate swap, net of tax of 2010: $(342), 2011: $437, 2012: $(149)	244	0	0	0	0	244
Comprehensive income	128,832	0	0	0	120,697	8,135
Exercise of stock options	2,804	4	2,800	0	0	0
Stock compensation	11,984	0	11,984	0	0	0
Tax benefit on stock compensation	16,108	0	16,108	0	0	0
Purchase of treasury stock	(20,670)	0	0	(20,670)	0	0
Balance, Ending at Dec. 29, 2012	$ 650,027	$ 141	$ 233,213	$ (147,352)	$ 576,424	$ (12,399)