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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 23, 2020	Sep. 25, 2019
Cash paid for:
Income taxes, net of refunds	$ 1,270	$ 2,483
Interest, net of amounts capitalized	584	157
Non-cash investing activities:
Accrued purchases of property and equipment	9,544	17,394
Capitalized equity-based compensation	29	79
Non-cash financing activities:
Establishment of liabilities under tax receivable agreement	414	20,027
Redemption or Exchange of Units | Class A Common Stock
Non-cash financing activities:
Class A common stock issued in connection with the redemption of LLC Interests	0	1
Redemption or Exchange of Units | Class B Common Stock
Non-cash financing activities:
Cancellation of Class B common stock in connection with the redemption of LLC Interests	$ 0	$ (1)

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