Noncontrolling interests (Details) (USD $)	3 Months Ended		9 Months Ended				9 Months Ended
	Oct. 02, 2011	Oct. 03, 2010	Oct. 02, 2011	Oct. 03, 2010	Oct. 02, 2011 Common Stock [Member]	Dec. 31, 2010 Common Stock [Member]	Oct. 02, 2011 Additional Paid-in Capital [Member]	Oct. 02, 2011 Retained Earnings [Member]	Oct. 02, 2011 Accumulated Other Comprehensive Income (Loss) [Member]	Oct. 02, 2011 Treasury Stock [Member]	Oct. 02, 2011 Noncontrolling Interest [Member]
Total shareholders' equity			$ 782,695,000		$ 2,900,000	$ 2,900,000	$ 323,200,000	$ 899,200,000	$ (3,600,000)	$ (466,200,000)	$ 27,200,000
Comprehensive Income [Abstract]
Consolidated net income	16,344,000	17,469,000	50,190,000	53,204,000				47,900,000			2,400,000
Sale of interest in business	(900,000)	0	(900,000)	0							(900,000)
Currency translation adjustment	(25,300,000)	30,900,000	(3,200,000)	(2,900,000)					(3,100,000)		(100,000)
Unamortized pension gains and prior service costs	(1,200,000)	1,300,000	1,800,000	3,400,000					1,800,000
Cash flow hedge [Abstract]
Net derivative gains (losses) arising during the year	1,500,000	(3,600,000)	100,000	1,400,000					100,000
Total comprehensive income (loss)			48,100,000					47,900,000	(1,200,000)		1,400,000
Dividends declared			(2,700,000)					(2,700,000)
Dividends to non-controlling interest			(500,000)								(500,000)
Employee benefit transactions			5,100,000				5,100,000
Income tax benefit arising from employee stock option plans			200,000				200,000
Stock based compensation			4,100,000				4,100,000
Purchase of common stock			(45,000,000)							(45,000,000)
Total shareholders' equity	791,933,000		791,933,000		2,900,000	2,900,000	332,500,000	944,400,000	(4,800,000)	(511,200,000)	28,100,000
Non-Controlling Details
Foreign currency translation loss upon liquidation	(1,400,000)	0	(1,400,000)	0
Ownership Interest Divested (in hundredths0	50.00%		50.00%
Ownership interest retained in hundredths	20.00%		20.00%
Fair Value of remaining interest	$ 600,000		$ 600,000