INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 29, 2019	Dec. 30, 2018
Deferred tax assets:
Allowance for doubtful accounts	$ 973	$ 1,049
Workers’ compensation	817	4,162
Accounts payable and other accrued expenses	3,818	3,957
Net operating loss carryforwards	2,085	2,103
Tax credit carryforwards	9,528	1,562
Accrued wages and benefits	5,148	7,016
Deferred compensation	6,622	5,438
Lease liabilities	8,670	0
Other	969	636
Total	38,630	25,923
Valuation allowance	(1,780)	(2,079)
Total deferred tax asset, net of valuation allowance	36,850	23,844
Deferred tax liabilities:
Prepaid expenses, deposits and other current assets	(1,282)	(2,054)
Lease right-of-use assets	(7,985)	0
Depreciation and amortization	(24,355)	(17,402)
Total deferred tax liabilities	(33,622)	(19,456)
Net deferred tax asset, end of year	$ 3,228	$ 4,388