Debt, Obligations Under Capital Leases and Deemed Landlord Financing Liabilities - Schedule of Debt (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 04, 2015	Dec. 31, 2019	Jan. 01, 2019	Jan. 02, 2018
Debt Instrument [Line Items]
Total outstanding indebtedness		$ 143,731	$ 158,386
Obligations under finance leases, other debt and deemed landlord financing liabilities		1,070	21,311
Total debt, net		144,801	179,697
Less: amounts due within one year		220	1,033
Total amounts due after one year, net		144,581	178,664
Amortization of Debt Issuance Costs and Discounts		400	0	$ 400
2015 Senior Credit Facility, as amended
Debt Instrument [Line Items]
Total outstanding indebtedness		143,731	158,386
Unamortized debt discount	$ 500		459
Deferred financing costs			$ 155
Unused commitment fee percentage (percent)	0.25%
Base Rate | 2015 Senior Credit Facility, as amended
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate, Increase (Decrease)		0.25%