Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2018	Apr. 04, 2017	Jan. 02, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected unredeemed percent	6.00%
Estimated redemption period	18 months
Revenue recognized	$ 1,800	$ 1,800
Period in which initial fees received from franchisees will be recognized as revenue	20 years
Retained earnings	$ (106,269)		$ (101,188)
Accrued Expenses and Other Current Liabilities
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Gift card liability	3,395		4,078
Other Long-term Liabilities
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Gift card liability, non-current	300		400
Calculated under Revenue Guidance in Effect on Adoption of Topic 606 | Accounting Standards Update 2014-09
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue recognized	$ 100
Retained earnings			$ 1,500