Income Taxes - Provision & Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Jan. 02, 2018
Income Taxes
Income before income taxes	$ 140,334	$ 107,411	$ 146,466
Current:
Federal	8,211	5,082	7,148
State	7,027	8,804	7,106
Total current	15,238	13,886	14,254
Deferred:
Federal	(3,695)	(4,549)	(24,570)
State	1,498	(961)	(610)
Total deferred	(2,197)	(5,510)	(25,180)
Total (benefit)/provision	$ 13,041	$ 8,376	$ (10,926)
U.S. statutory corporate tax rate (as a percent)	21.00%	21.00%	35.00%
Income tax benefit due to revalue of deferred tax assets and liabilities			$ 38,500
Income Taxes Rate Reconciliation
U.S. federal statutory rate (as a percent)	21.00%	21.00%	35.00%
State and district income taxes, net of federal benefit (as a percent)	4.90%	6.10%	3.30%
Credit for FICA taxes paid on tips (as a percent)	(12.80%)	(16.50%)	(9.40%)
Other credits and incentives (as a percent)	(1.40%)	(2.50%)	(1.90%)
Manufacturing deduction (as a percent)			(2.30%)
Deferred compensation (as a percent)	(1.70%)	0.80%	(1.50%)
Equity compensation (as a percent)	(0.20%)	(1.50%)	(4.50%)
Impact of statutory rate change on deferred taxes (as a percent)			(26.30%)
Other (as a percent)	(0.50%)	0.40%	0.10%
Effective tax rate (as a percent)	9.30%	7.80%	(7.50%)