Leases - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 18, 2019 USD ($) leaseback_arrangement
Lessee, Lease, Description [Line Items]
Lease renewal period	5 years
Minimum lease payments related to restaurant leases that have not yet commenced	$ 22.5
Number of sale leaseback transaction arrangements | leaseback_arrangement	3
Net proceeds from sale leaseback transaction	$ 12.7
Loss on sale leaseback transaction	$ 0.2
Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease term	20 years
Land and Building [Member]
Lessee, Lease, Description [Line Items]
Term of sale leaseback contract	20 years