Employee Stock Benefit Plans (Schedule Of Stock-Based Compensation Expense, Net Of Tax, Related To Employee Stock-Based Compensation (For All Plans)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2016	Jan. 01, 2016	Jan. 02, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 52.6	$ 50.1	$ 43.4
Cost Of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	3.8	3.9	3.2
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	9.1	8.7	6.8
Sales And Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	8.3	9.1	7.6
General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	31.4	28.4	25.8
Total Operating Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 48.8	$ 46.2	$ 40.2