Other Comprehensive Income Components of Other Comprehensive Income (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		$ 7,500,000		$ 7,500,000
Net earnings	40,942,000	29,769,000	104,007,000	82,909,000
Currency Translation Adjustment	6,559,000	6,042,000		4,500,000
Pension liability adjustment, net of tax	(16,000)	130,000		271,000
Unrealized gain on interest rate swaps, net of tax	(362,000)	15,000	550,000	(38,000)
Comprehensive income	$ 47,123,000	$ 35,956,000	$ 103,375,000	$ 87,642,000