Revenue from Contracts with Customers - Loyalty Reward Liability and Gift Card Liability (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 25, 2020	Dec. 30, 2020
Change in Contract with Customer, Liability [Roll Forward]
Contract with Customer, Liability	$ 5,628	$ 6,317	$ 6,317
Revenue deferred	177
Contract with Customer, Liability	5,642	5,999	5,628
Gift card liability	3,386		4,008
Revenue recognized from gift card liability	$ 163	318
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Change in Contract with Customer, Liability [Roll Forward]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-12-29
Change in Contract with Customer, Liability [Roll Forward]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-12-28
Change in Contract with Customer, Liability [Roll Forward]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-12-26
Change in Contract with Customer, Liability [Roll Forward]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-12-25
Change in Contract with Customer, Liability [Roll Forward]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Loyalty reward program
Change in Contract with Customer, Liability [Roll Forward]
Contract with Customer, Liability	$ 900	1,084	1,084
Revenue deferred	625		2,463
Revenue recognized	(865)		(2,647)
Contract with Customer, Liability	$ 660		900
Loyalty reward program | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Change in Contract with Customer, Liability [Roll Forward]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Gift card liability
Change in Contract with Customer, Liability [Roll Forward]
Gift card liability	$ 3,386		$ 4,008
Revenue recognized from gift card liability	$ 1,819	$ 1,245