Revenues - Contract Balances (Details) - USD ($) $ in Thousands		6 Months Ended
	Dec. 25, 2019	Jun. 24, 2020
Movement in Deferred Revenue [Roll Forward]
Balance, December 25, 2019		$ 23,256
Fees received from franchisees		389
Revenue recognized		(1,528)
Balance, June 24, 2020	$ 23,256	22,117
Less current portion included in other current liabilities		2,112
Deferred franchise revenue included in other noncurrent liabilities		$ 20,005
Deferred revenue recognized	$ 1,500