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STOCK BASED COMPENSATION - Assumptions of fair value of stock options (Details)
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Assumptions utilized to calculate fair value of stock options granted      
Expected option term 6 years   6 years
Expected stock price volatility 35.00% 30.00%  
Risk-free interest rate 2.99%    
Expected stock price volatility, maximum     35.00%
Expected stock price volatility, minimum     30.00%
Risk-free interest rate, minimum   2.05% 1.31%
Risk-free interest rate, maximum   2.18% 1.57%
Expected dividend yield
Minimum      
Assumptions utilized to calculate fair value of stock options granted      
Expected option term   5 years  
Maximum      
Assumptions utilized to calculate fair value of stock options granted      
Expected option term   6 years