Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 28, 2018	Dec. 29, 2017
Income Tax Disclosure [Abstract]
Purchased intangibles	$ 166.0	$ 69.8
Depreciation and amortization	5.2	13.1
Deferred revenue		1.3
Other	9.5	8.4
Total deferred tax liabilities	180.7	92.6
Expenses not currently deductible	33.4	24.7
U.S. tax credit carryforwards	30.3	21.9
U.S. net operating loss carryforwards	20.8	6.4
Foreign net operating loss carryforwards	16.9	20.2
Stock-based compensation	20.3	21.4
Global Intangible Low-Taxed Income	13.4
Deferred revenue	3.6
Other	8.2	(4.4)
Total deferred tax assets	146.9	90.2
Valuation allowance	(27.8)	(25.2)
Total deferred tax assets	119.1	65.0
Total net deferred tax liabilities	(61.6)	(27.6)
Non-current deferred income tax assets	12.2	20.2
Non-current deferred income tax liabilities	$ (73.8)	$ (47.8)	[1]

[1] See Note 2 for a summary of adjustments