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STOCKHOLDERS' EQUITY - Restricted Stock Unit Grants (Narrative) (Details) - RSUs
shares in Millions
6 Months Ended
Jun. 24, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSUs granted to certain employees (in shares) | shares 0.4
Grant date fair value per RSU (in dollars per share) | $ / shares $ 354.54
Award vesting period 3 years