ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable and Advertising (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts receivable	$ 1.6	$ 1.3
Advertising expense	61.9	42.9	$ 39.0
Prepaid advertising	$ 1.2	$ 0.9
Accounts Receivable | Customer Concentration Risk | One Customer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer concentration	36.00%	30.00%
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable uncollateralized customer obligations trading days	30 days
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable uncollateralized customer obligations trading days	90 days