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Segment and Geographic Information (Sales by Geographic Information) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Concentration risk percentage									52.00%	53.00%	57.00%
Total sales	$ 303,034	$ 305,088	$ 314,464	$ 292,426	$ 302,260	$ 286,168	$ 280,916	$ 266,736	$ 1,215,012	$ 1,136,080	$ 1,075,502
UNITED STATES [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales									687,259	662,133	625,670
PUERTO RICO [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales									146,500	140,184	162,343
Rest Of World [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales									319,209	278,399	233,988
COSTA RICA
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales									$ 62,044	$ 55,364	$ 53,501

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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