Basis of Presentation and Significant Accounting Policies (Concentration Risk) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Risks and Uncertainties [Abstract]
Revenue recognized on shipments to distributors	$ 4.1		$ 12.3
Allowance for doubtful accounts	$ 9.4		$ 9.4		$ 9.4
Revenue | Sell-Through Distributors Concentration Risk
Risks and Uncertainties [Abstract]
Concentration Risk	86.00%	76.00%	87.00%	73.00%
Top Five Customers | Revenue | Customer Concentration Risk
Risks and Uncertainties [Abstract]
Concentration Risk	17.00%	27.00%	17.00%	32.00%
Largest Customer | Revenue | Customer Concentration Risk
Risks and Uncertainties [Abstract]
Concentration Risk	5.00%	9.00%	5.00%	10.00%
Largest Distributor Group | Trade receivables | Sell-Through Distributors Concentration Risk
Risks and Uncertainties [Abstract]
Concentration Risk			73.00%		66.00%
Second Largest Distributor Group | Trade receivables | Sell-Through Distributors Concentration Risk
Risks and Uncertainties [Abstract]
Concentration Risk			13.00%		0.00%