Revenue from Contracts with Customers - Change in Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 24, 2020	Jun. 30, 2021	Jun. 24, 2020	Dec. 30, 2020
Change in Contract with Customer, Liability [Roll Forward]
Contract with Customer, Liability			$ 5,628	$ 6,317	$ 6,317
Revenue recognized - beginning balance			(349)	(544)
Additional contract liability			384
Contract with Customer, Liability	$ 5,663	$ 5,773	5,663	5,773	$ 5,628
Gift card liability
Change in Contract with Customer, Liability [Roll Forward]
Revenue recognized - beginning balance	$ (318)	$ (77)	$ (1,420)	$ (753)