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RELATED PARTY TRANSACTIONS - Schedule of Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 23, 2020	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Related Party Transaction [Line Items]
Tax receivable agreement payments to related parties	$ 0	$ 6,643	$ 707
Establishment of tax receivable agreement liability		232,954	234,426
Payments to noncontrolling interests		478	1,708	$ 751
Board of Directors Chairman | Square, Inc
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party		1,697	1,692	445
Board of Directors Chairman | Mobo Systems, Inc.
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party		242	170	111
Share Our Strength
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party		0	30	53
Charitable campaign flow through		0	190	343
Entity with Common Management
Related Party Transaction [Line Items]
Due to related parties, current		0
Entity with Common Management | Square, Inc
Related Party Transaction [Line Items]
Due to related parties, current		0
Entity with Common Management | Mobo Systems, Inc.
Related Party Transaction [Line Items]
Due to related parties, current		0
Entity with Common Management | Rent Expense
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party		846	964	877
Due to related parties, current		0	53
Entity with Common Management | Share Our Strength
Related Party Transaction [Line Items]
Due to related parties, current		0
Entity with Common Management | USHG Acquisition Corp
Related Party Transaction [Line Items]
Due to related parties, current		0
Subsidiary to Affiliated Entity | Concession Income
Related Party Transaction [Line Items]
Revenue from related parties		67	571	$ 420
Due from related parties, current		$ 8	$ 47

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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