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STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Dec. 30, 2017
Stockholders' Equity Note [Abstract]      
Authorizations remaining $ 824,200    
Payments to noncontrolling interests $ 1,547 $ 0  
Decrease in non-controlling interest     $ 4,900
Variable consideration in accrued expenses     1,900
Variable consideration in other long-term liabilities     $ 3,000