Summary of Significant Accounting Policies - Property and Equipment At Cost and Depreciable Useful Lives (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2016	Dec. 28, 2014	Dec. 29, 2013
Property, Plant and Equipment [Line Items]
Property and Equipment:	$ 361.8	$ 360.0
Depreciation expense	21.4	20.3	$ 18.4
Land
Property, Plant and Equipment [Line Items]
Property and Equipment:	3.8	3.8
Work in process
Property, Plant and Equipment [Line Items]
Property and Equipment:	2.5	6.9
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and Equipment:	$ 60.2	59.7
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	45 years
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and Equipment:	$ 229.5	221.7
Computer hardware and software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer hardware and software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	12 years
Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and Equipment:	$ 34.0	34.1
Estimated useful life	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and Equipment:	$ 31.8	$ 33.8
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years