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Segment and Geographic Information (Long lived Tangible Assets by Region) (Details) - USD ($)
$ in Thousands
Dec. 28, 2018
Dec. 29, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Long-lived tangible assets $ 231,269 $ 235,180
UNITED STATES [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long-lived tangible assets 151,851 157,808
MEXICO    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long-lived tangible assets 34,606 28,985
IRELAND    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long-lived tangible assets 32,190 33,992
Rest Of World [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long-lived tangible assets $ 12,622 $ 14,395