Components of Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Comprehensive Income (Loss) [Line Items]
Net earnings	$ 31,045	$ 19,628	$ 53,140	$ 37,453
Currency translation adjustment	(7,527)	1,285	(1,542)	1,844
Pension liability adjustment, net of tax	169	0	141	0
Unrealized gain on interest rate swaps, net of tax	(95)	(272)	(53)	(198)
Comprehensive income	$ 23,592	$ 20,641	$ 51,686	$ 39,099