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NATURE OF OPERATIONS - Organizational Transactions (Details)		12 Months Ended
	Feb. 04, 2015	Dec. 26, 2018 shares	Dec. 27, 2017 shares
Class of Stock [Line Items]
LLC interests acquired (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 B Common Stock | Common stock
Class of Stock [Line Items]
Effect of redemption (in shares)		2,692,660	1,003,585
Class A Common Stock
Class of Stock [Line Items]
Ratio of common stock to limited liability company interest	1

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