Revenue Recognition - Transaction Price Allocated to Remaining Performance Obligations (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 27, 2020
Performance Obligations by Period
Total deferred revenue	$ 33,088	$ 33,254
Franchise royalties and fees
Performance Obligations by Period
Less than 1 Year	2,242
1-2 Years	2,003
2-3 Years	1,766
3-4 Years	1,550
4-5 Years	1,294
Thereafter	2,477
Total deferred revenue	11,332
Area development fees
Performance Obligations by Period
Total deferred revenue	1,500
Gift Card
Performance Obligations by Period
Total deferred revenue	$ 5,100