Nature of Operations and Accounting Policies Nature of Operations and Accounting Policies (Narrative) (Details) (Details) $ in Millions	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017 plan segments	Jan. 01, 2017	Jan. 03, 2016	Jan. 01, 2018 USD ($)
Number of Stock-based Compensation Plans | plan		1
Number of Operating Segments | segments		2
Operating Cycle		52		53
License and services revenue as a percentage of total revenue		4.50%	5.07%
Minimum [Member] | Building [Member]
Property, Plant and Equipment, Useful Life, Maximum		10 years
Minimum [Member] | Tools, Dies and Molds [Member]
Property, Plant and Equipment, Useful Life, Maximum		3 years
Maximum [Member] | Building [Member]
Property, Plant and Equipment, Useful Life, Maximum		40 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life, Maximum		7 years
Scenario, Forecast [Member]
Operating Cycle	52
Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 9.3
Tax impact of Cumulative Adjustments, Deferred Income Tax					3.2
Impact of New Accounting Principle, Deferred Revenue					(12.5)
Impact of New Accounting Principle, Cash Flows					$ 0.0