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SHAREHOLDERS' EQUITY Changes in Shareholders’ Equity (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Dec. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (in shares) 40,054    
Beginning balance $ 591,439    
Net income $ 8,276 $ 8,755  
Ending balance (in shares) 40,152   40,054
Ending balance, net of tax $ 598,287 $ 563,936 $ 591,439
Common Stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (in shares) 40,054 41,098 41,098
Beginning balance $ 1 $ 1 $ 1
Purchases and retirement of common stock (in shares) (234) 0  
Issuances under equity plans, including tax benefits (in shares) 308 218  
Stock-based compensation (in shares) 24 18  
Ending balance (in shares) 40,152 41,334 40,054
Ending balance, net of tax $ 1 $ 1 $ 1
Retained earnings      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 606,087 561,650 561,650
Net income 8,276 8,755  
Purchases and retirement of common stock (1) (5,303) 0  
Issuances under equity plans, including tax benefits (1,057) (1,691)  
Stock-based compensation 3,606 3,409  
Change in accounting standard cumulative-effect adjustment 0 1,525  
Ending balance, net of tax 611,609 573,648 606,087
Accumulated other comprehensive loss      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (14,649) (6,804) (6,804)
Foreign currency translation adjustment 1,326 (1,384)  
Change in accounting standard cumulative-effect adjustment 0   (1,525)
Ending balance, net of tax $ (13,323) $ (9,713) (14,649)
Accumulated Net Investment Gain (Loss) Attributable to Parent      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Change in accounting standard cumulative-effect adjustment     $ 1,525