LEASES - Components of lease cost (Details) $ in Thousands	12 Months Ended
	Dec. 29, 2019 USD ($) item
LEASES
Amortization of ROU asset	$ 96
Interest on lease liabilities	78
Operating lease costs	13,624
Short-term lease cost	2,119
Variable lease cost	2,444
Sublease income	(5,931)
Total lease costs	$ 12,430
Restrictions, covenants or guarantees on sublease arrangements. | item	0