INCOME TAXES - Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018
Income Taxes
Federal statutory tax rate	21.00%	21.00%
State taxes, net of valuation allowance and federal benefit	(4.70%)	2.20%
Deferred rate change	11.90%	(0.60%)
Foreign taxes	(2.00%)	1.40%
Tax effect of permanent differences	0.50%	(0.10%)
Tax effect of general business credits	24.30%	(3.40%)
Tax effect of foreign tax credit	2.00%	(3.20%)
Uncertain tax positions	0.30%	(0.10%)
Return to provision update	(173.80%)	(15.70%)
Change in valuation allowance	171.80%	11.50%
Other	0.90%
Effective tax rate	52.20%	13.00%