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STOCKHOLDER'S EQUITY (Details)
 12 Months Ended
Feb. 04, 2015
Dec. 26, 2018
$ / shares
shares
Dec. 27, 2017
$ / shares
shares
Class of Stock [Line Items]      
Preferred stock, shares authorized (in shares)   10,000,000 10,000,000
LLC interests acquired (in shares)   2,692,660 1,003,585
Class A Common Stock      
Class of Stock [Line Items]      
Common stock, shares, issued (in shares)   29,520,833 26,527,477
Common stock, shares authorized (in shares)   200,000,000 200,000,000
Common stock par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001
Ratio of common stock to limited liability company interest 1    
Class B Common Stock      
Class of Stock [Line Items]      
Common stock, shares, issued (in shares)   7,557,347 10,250,007
Common stock, shares authorized (in shares)   35,000,000 35,000,000
Common stock par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001
Common stock | Class A Common Stock      
Class of Stock [Line Items]      
Redemptions (in shares)   2,692,660 1,003,585
Common stock | Class B 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
LLC interests acquired (in shares)   2,993,356  
Stock options      
Class of Stock [Line Items]      
LLC interests acquired (in shares)   300,696 372,508