SUPPLEMENTAL STATEMENT OF CASH FLOWS INFORMATION - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Supplemental Cash Flow Information [Abstract]
Liabilities related to property and equipment outstanding	$ 5.3	$ 1.0	$ 1.3
Accrued dividends payable on unvested options	$ 0.0	$ 0.4	$ 1.7