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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 5) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended 44 Months Ended
May 31, 2014
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Dec. 30, 2017
Feb. 28, 2015
Research and Development            
Research and development expenses   $ 11,600 $ 8,300 $ 11,600    
Stock Repurchase Program            
Authorized amount $ 500,000         $ 250,000
Length of authorization period 12 months          
Shares acquired under share repurchase program   0 441,949 1,435,488 4,588,131  
Amount paid for share repurchase   $ 0 $ 53,800 $ 168,983 $ 617,800