INCOME TAXES - Unrecognized Tax Benefits Roll Forward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Income Tax Disclosure [Abstract]
Beginning balance	$ 5.0	$ 5.3	$ 3.0
Additions for tax positions of prior years		0.4	0.4
Addition for Power Solutions acquisition			2.2
Reductions for tax positions of prior years	(0.3)	(0.7)	(0.3)
Ending balance	$ 4.7	$ 5.0	$ 5.3