INCOME TAXES - Reconciliation of income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Income Tax Disclosure [Abstract]
Income taxes at the statutory rate	$ 43,092	$ 14,124	$ 14,619
Increase (decrease) resulting from:
State income taxes, net of federal tax effect	7,816	2,989	2,030
Nondeductible expenses	63	203	248
Research and development tax credits	(580)	(2,157)	(578)
Tax expense (benefit) related to stock-based compensation	(611)	950	(2,396)
Nondeductible interest expense	0	0	4
Revaluation of deferred tax assets for state income taxes	2	(92)	(1,154)
Other	(382)	807	(921)
Total income tax expense	$ 49,400	$ 16,824	$ 11,852

Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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