Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 3.0	$ 2.8
Interest and penalties	0.1	(0.1)	$ 0.0
Penalties and interest accrued	0.2	$ 0.1
Accumulated foreign earnings considered permanently reinvested	32.4
U.S tax cost on unremitted foreign earnings	9.6
U.S. state
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.1
Tax credit carryforward, amount	$ 2.0