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VARIABLE INTEREST ENTITY (Details) $ in Thousands		3 Months Ended
VARIABLE INTEREST ENTITY (Details) $ in Thousands	Jul. 18, 2018 USD ($)	Apr. 03, 2022 USD ($) agreement	Apr. 04, 2021 USD ($)	Jan. 02, 2022 USD ($)
Variable Interest Entities
Number of installment agreements with franchisees \| agreement		1
Net loss		$ (647)	$ (697)
Net loss attributable to noncontrolling interest		120	102
Property, equipment and leasehold improvements, net		39,748		$ 39,943
Operating lease right-of-use assets		81,248		78,843
Inventory		$ 3,281		$ 3,316
Mercury
Variable Interest Entities
Promissory note	$ 3,900
Interest rate on promissory note	8.00%
Percentage of excess cash flows to be used to repay note receivable	100.00%
Mercury
Variable Interest Entities
Ownership percentage in VIE	20.00%	20.00%
Clark \| Mercury
Variable Interest Entities
Ownership percentage	80.00%
Mercury
Variable Interest Entities
Net loss		$ 150	$ 128
Property, equipment and leasehold improvements, net		2,400
Operating lease right-of-use assets		1,700
Inventory		$ 121