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Segment Information (Geographic Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 26, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012
Geographic Information [Line Items]
Net Sales	$ 306,005us-gaap_SalesRevenueNet	$ 302,614us-gaap_SalesRevenueNet	$ 322,549us-gaap_SalesRevenueNet	$ 289,962us-gaap_SalesRevenueNet	$ 271,923us-gaap_SalesRevenueNet	$ 277,035us-gaap_SalesRevenueNet	$ 286,020us-gaap_SalesRevenueNet	$ 269,046us-gaap_SalesRevenueNet	$ 1,221,130us-gaap_SalesRevenueNet	$ 1,104,024us-gaap_SalesRevenueNet	$ 1,012,456us-gaap_SalesRevenueNet
Long-Lived Assets	161,230us-gaap_NoncurrentAssets				151,717us-gaap_NoncurrentAssets				161,230us-gaap_NoncurrentAssets	151,717us-gaap_NoncurrentAssets
US
Geographic Information [Line Items]
Net Sales									577,359	498,478	440,757
Long-Lived Assets	131,131				120,262				131,131	120,262
Other Countries
Geographic Information [Line Items]
Net Sales									643,771	605,546	571,699
Long-Lived Assets	$ 30,099				$ 31,455				$ 30,099	$ 31,455