Business Segment, Geographic And Concentration Risk Information (Sales by Geographic Information) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Jan. 02, 2015	Oct. 03, 2014	Jul. 04, 2014	Apr. 04, 2014	Jan. 01, 2016	Jan. 02, 2015	Jan. 03, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	$ 317,567	$ 146,637	$ 174,890	$ 161,320	$ 169,726	$ 171,699	$ 172,081	$ 174,281	$ 800,414	$ 687,787	$ 663,945
UNITED STATES [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales									401,380	312,539	325,090
PUERTO RICO [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales									136,898	127,702	117,961
BELGIUM [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales									62,546	65,308	67,155
Rest Of World [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales									$ 199,590	$ 182,238	$ 153,739