Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Income Tax Disclosure [Abstract]
U.S. federal statutory expense (benefit)	$ 18.2	$ 16.9	$ 12.6
State and local income taxes, net	1.9	2.5	1.4
Transaction costs	1.1	0.0	0.0
Nondeductible items	0.2	0.2	0.5
Other, net	(0.1)	(0.1)	(0.1)
Total	$ 21.3	$ 19.5	$ 14.4