Income Taxes Effective Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 03, 2021	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax provision (benefit)		$ (4,865)	$ (9,249)	$ 2,089
State income taxes (benefit), net of federal provision (benefit)		(726)	(1,655)	325
Employment tax credits		(2,585)	(2,938)	(3,059)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 12,900	13,138	0	0
Non-deductible expenses		214	1,374	415
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount		525	308	(53)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		312	0	0
Miscellaneous		281	37	126
Provision (benefit) for income taxes		$ 6,294	$ (12,123)	$ (157)