Property, Plant And Equipment (Components Of Property, Plant And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 28, 2013
Property, Plant And Equipment [Abstract]
Land and improvements	$ 9,998	$ 9,777
Buildings and improvements	135,747	135,468
Machinery and equipment	686,638	678,311
Software	33,471	33,476
Capital lease	597	309
Construction in progress	8,304	13,485
Property, plant and equipment, gross, total	874,755	870,826
Accumulated depreciation	(631,991)	(625,593)
Property, plant and equipment, net, total	$ 242,764	$ 245,233