INCOME TAXES - Components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Jan. 02, 2021	Dec. 28, 2019
Deferred tax assets:
Accrued liabilities	$ 6,857	$ 4,482
Allowances and other reserves	2,979	2,030
Inventory	5,012	1,929
Stock-based compensation	4,796	4,761
Operating lease liabilities	10,714	12,286
Deferred interest	0	1,703
Other	2,360	1,497
Total deferred tax assets	32,718	28,688
Deferred tax liabilities:
Operating lease assets	(8,222)	(9,528)
Prepaid expenses	(644)	(1,897)
Property and equipment	(11,425)	(10,971)
Intangible assets	(15,843)	(13,546)
Other	(745)	(744)
Total deferred tax liabilities	(36,879)	(36,686)
Net deferred tax liabilities	(4,161)	(7,998)
Deferred income taxes	1,062	1,082
Other liabilities	$ (5,223)	$ (9,080)