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NATURE OF OPERATIONS - Secondary Offering (Details) - shares
 12 Months Ended
Dec. 26, 2018
Dec. 27, 2017
Class of Stock [Line Items]    
Units acquired during the period (in shares) 2,692,660 1,003,585
Ownership percent of noncontrolling interest 79.60% 72.10%
Noncontrolling owners ownership percentage 20.40% 27.90%
Class A Common Stock | Common stock    
Class of Stock [Line Items]    
Redemptions (in shares) 2,692,660 1,003,585
Class B Common Stock | Common stock    
Class of Stock [Line Items]    
Effect of redemption (in shares) 2,692,660 1,003,585
Limited Liability Company    
Class of Stock [Line Items]    
Number of units redeemed (in shares) 2,692,660 1,003,585
Units acquired during the period (in shares) 2,993,356