CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Accumulated Other Comprehensive Income (loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Paid-in Capital [Member]	Common Stock [Member]
Balance, Beginning at Jan. 03, 2015	$ 1,006,760	$ (31,431)	$ 923,664	$ (196,026)	$ 310,409	$ 144
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	191,610	0	191,610	0	0	0
Currency translation adjustments	(28,187)	(28,187)	0	0	0	0
Change in unrecognized pension benefit costs, net of tax of 2010: $105, 2011: $3,200, 2012: $(137)	(17,039)	(17,039)	0	0	0	0
Unrealized gain on interest rate swap, net of tax of 2010: $(342), 2011: $437, 2012: $(149)	245	245	0	0	0	0
Stock compensation	15,863	0	0	0	15,863	0
Tax benefit on stock compensation	2,414	0	0	0	2,414	0
Purchase of treasury stock	(4,836)	0	0	(4,836)	0	0
Balance, Ending at Jan. 02, 2016	1,166,830	(76,412)	1,115,274	(200,862)	328,686	144
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	284,216	0	284,216	0	0	0
Currency translation adjustments	(63,569)	(63,569)	0	0	0	0
Change in unrecognized pension benefit costs, net of tax of 2010: $105, 2011: $3,200, 2012: $(137)	(149,815)	(149,815)	0	0	0	0
Unrealized gain on interest rate swap, net of tax of 2010: $(342), 2011: $437, 2012: $(149)	5,473	5,473	0	0	0	0
Stock compensation	27,905	0	0	0	27,905	0
Tax benefit on stock compensation		0	0			0
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	1,304				1,304
Purchase of treasury stock	(4,418)	0	0	(4,418)	0	0
Balance, Ending at Dec. 31, 2016	1,265,318	(284,323)	1,399,490	(205,280)	355,287	144
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	298,128	0	298,128	0	0	0
Currency translation adjustments	46,690	46,690	0	0	0	0
Change in unrecognized pension benefit costs, net of tax of 2010: $105, 2011: $3,200, 2012: $(137)	(29,669)	(29,669)	0	0	0	0
Unrealized gain on interest rate swap, net of tax of 2010: $(342), 2011: $437, 2012: $(149)	883	883	0	0	0	0
Stock compensation	6,237	0	0	0	6,237	0
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	13,399	0	0	0	13,398	1
Purchase of treasury stock	(239,838)	0	0	(239,838)	0	0
Balance, Ending at Dec. 30, 2017	$ 1,361,148	$ (266,419)	$ 1,697,618	$ (445,118)	$ 374,922	$ 145