Industry Segment and Geographic Area Information Schedule of Revenue by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Sales by Geographic Area [Line Items]
Total sales	$ 2,237,219	$ 2,157,586	$ 2,105,188
UNITED STATES
Sales by Geographic Area [Line Items]
Total sales	849,356	826,991	812,934
CHINA
Sales by Geographic Area [Line Items]
Total sales	276,230	254,838	216,425
UNITED KINGDOM
Sales by Geographic Area [Line Items]
Total sales	134,614	133,611	118,611
GERMANY
Sales by Geographic Area [Line Items]
Total sales	107,081	99,153	105,735
FRANCE
Sales by Geographic Area [Line Items]
Total sales	84,946	81,719	84,395
JAPAN
Sales by Geographic Area [Line Items]
Total sales	93,811	95,676	114,300
ITALY
Sales by Geographic Area [Line Items]
Total sales	85,433	78,120	69,599
Other International [Member]
Sales by Geographic Area [Line Items]
Total sales	605,748	587,478	583,189
Total international [Member]
Sales by Geographic Area [Line Items]
Total sales	$ 1,387,863	$ 1,330,595	$ 1,292,254