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ACQUISITIONS (Supplemental Unaudited Pro Forma Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jul. 01, 2018
Jun. 25, 2017
Income per share:      
Effective Income Tax Rate Reconciliation, Percent 11.40% 15.20%  
Zycron, Inc.      
Business Acquisition [Line Items]      
Revenues $ 71,487 $ 8,700  
Gross profit 18,389    
Net income $ 2,310 $ 700  
Income per share:      
Basic pro forma (in usd per share) $ 0.26    
Diluted pro forma (in usd per share) $ 0.26    
Pro Forma      
Income per share:      
Effective Income Tax Rate Reconciliation, Percent     39.00%
Pro Forma | Revolving Credit Facility      
Income per share:      
Line of credit facility, interest rate during period   4.50%