Other Comprehensive Income Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Net earnings	$ 54,267	$ 48,405	$ 92,498	$ 81,850
Currency Translation Adjustment	6,669	1,856	(9,122)	3,430
Pension liability adjustment, net of tax	(89)	38	(25)	(19)
Unrealized gain on interest rate swaps, net of tax	302	(261)	(170)	3
Comprehensive income	$ 61,149	$ 50,038	$ 83,231	$ 85,264