NATURE OF OPERATIONS - Secondary Offering (Details) - shares	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Class of Stock [Line Items]
Units acquired during the period (in shares)		4,412,150
Class A Common Stock | Common stock
Class of Stock [Line Items]
Redemptions (in shares)	194,009	1,721,887	2,692,660
Class B Common Stock | Common stock
Class of Stock [Line Items]
Effect of redemption (in shares)	194,009	1,721,887	2,692,660
Limited Liability Company
Class of Stock [Line Items]
Number of units redeemed (in shares)	194,009	4,412,150	2,692,660
Units acquired during the period (in shares)	650,951