Debt, Obligations Under Capital Leases and Deemed Landlord Financing Liabilities - 2015 Revolving Credit Facility (Successor) (Details) - USD ($)		12 Months Ended
	Aug. 04, 2015	Dec. 31, 2019	Jan. 01, 2019	Jan. 02, 2018
Debt Instrument [Line Items]
Payments on revolving credit facility		$ 55,000,000	$ 25,000,000	$ 37,500,000
Amortization of deferred financing costs including debt discount		400,000	0	$ 400,000
2015 Senior Credit Facility, as amended
Debt Instrument [Line Items]
Credit agreement issuance date	Aug. 04, 2015
Credit agreement maturity date	Aug. 04, 2020
Credit facility amount	$ 250,000,000
Credit facility		17,300,000
Credit fees applicable margin percentage (percent)	2.00%
Unused commitment fee percentage (percent)	0.25%
Unamortized debt discount	$ 500,000		$ 459,000
Deferred financing costs		$ 1,000,000
Interest rate on outstanding balance of credit facility (percent)		3.55%
Availability for additional borrowings under credit facility		$ 87,700,000
2015 Senior Credit Facility, as amended		$ 145,000,000
2015 Senior Credit Facility, as amended | Federal Funds Effective Swap
Debt Instrument [Line Items]
Effective base rate, margins on variable rate (percent)	0.50%
2015 Senior Credit Facility, as amended | LIBOR
Debt Instrument [Line Items]
Effective base rate, margins on variable rate (percent)	1.00%
Credit facility margins on variable rate (percent)	2.00%
Minimum | 2015 Senior Credit Facility, as amended | LIBOR
Debt Instrument [Line Items]
Credit facility margins on variable rate (percent)	1.50%
Minimum | 2015 Senior Credit Facility, as amended | Base Rate
Debt Instrument [Line Items]
Credit facility margins on variable rate (percent)	0.50%
Maximum | 2015 Senior Credit Facility, as amended | LIBOR
Debt Instrument [Line Items]
Credit facility margins on variable rate (percent)	2.50%
Maximum | 2015 Senior Credit Facility, as amended | Base Rate
Debt Instrument [Line Items]
Credit facility margins on variable rate (percent)	1.50%