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SHAREHOLDERS' EQUITY (Details) - USD ($)
 3 Months Ended 6 Months Ended
Feb. 28, 2020
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Oct. 16, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (in shares)       38,593,000    
Ending balance (in shares)   36,052,000   36,052,000    
Beginning balance       $ 625,973,000    
Net income (loss)   $ (8,168,000) $ 19,406,000 (158,662,000) $ 27,682,000  
Foreign currency translation adjustment   2,098,000 (693,000) (4,527,000) 633,000  
Ending balance, net of tax   412,761,000 $ 615,007,000 412,761,000 $ 615,007,000  
Stock repurchase program remaining authorized amount   $ 66,700,000   $ 66,700,000    
Percentage of stock repurchased during the period, Percentage 80.00%          
Common stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (in shares)   36,128,000 40,152,000 38,593,000 40,054,000  
Purchases and retirement of common stock (in shares)   0 (156,000) (2,930,000) (390,000)  
Issuances under equity plans, including tax benefits (in shares)   (76,000) 58,000 339,000 366,000  
Stock-based compensation (in shares)   0 4,000 50,000 28,000  
Ending balance (in shares)   36,052,000 40,058,000 36,052,000 40,058,000  
Beginning balance   $ 1,000 $ 1,000 $ 1,000 $ 1,000  
Ending balance, net of tax   1,000 1,000 1,000 1,000  
Retained earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance   435,804,000 611,609,000 639,210,000 606,087,000  
Net income (loss)   (8,168,000) 19,406,000 (158,662,000) 27,682,000  
Purchases and retirement of common stock   0 (3,774,000) (52,346,000) (9,077,000)  
Net issuance under equity plans, including tax benefits   51,000 127,000 (1,420,000) (930,000)  
Stock-based compensation   2,838,000 1,654,000 4,345,000 5,260,000  
Change in accounting standard cumulative-effect adjustment   0 0 (602,000) 0  
Ending balance, net of tax   430,525,000 629,022,000 430,525,000 629,022,000  
Accumulated other comprehensive loss            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance   (19,863,000) (13,323,000) (13,238,000) (14,649,000)  
Foreign currency translation adjustment   2,098,000 (693,000) (4,527,000) 633,000  
Ending balance, net of tax   $ (17,765,000) $ (14,016,000) $ (17,765,000) $ (14,016,000)  
Common stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Purchases and retirement of common stock (in shares) (2,150,538)          
Purchases and retirement of common stock $ (40,000,000.0)          
Stock repurchase program authorized amount           $ 100,000,000.0