Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at beginning of year	$ 9.4	$ 7.2	$ 6.4
Gross increases - tax positions in prior periods	1.4	2.5	1.7
Gross decreases - tax positions in prior periods		(0.3)	(0.5)
Gross increases - tax positions in the current period	1.0	0.5	0.5
Settlements with taxing authorities	(3.6)
Lapsing of statutes of limitations	(0.5)	(0.5)	(0.9)
Unrecognized tax benefits at end of year	$ 7.7	$ 9.4	$ 7.2