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NON-CONTROLLING INTERESTS - Narrative (Details)		1 Months Ended	12 Months Ended
	Feb. 04, 2015	Aug. 31, 2019 shares	Dec. 30, 2020 shares	Dec. 25, 2019 shares	Dec. 26, 2018 shares
Noncontrolling Interest [Line Items]
Weighted average ownership percentage			7.70%	15.90%
Effect of GTC Merger (in shares)		2,690,263		2,690,263
Units acquired during the period (in shares)				4,412,150
Class A Common Stock
Noncontrolling Interest [Line Items]
Ratio of common stock to limited liability company interest	1
Limited Liability Company
Noncontrolling Interest [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
Stock options
Noncontrolling Interest [Line Items]
Units acquired during the period (in shares)			456,942	484,319	300,696

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770

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