Reporting Segment And Geographic Information (Schedule Of Long-Lived Assets) (Details) - USD ($) $ in Millions	Dec. 28, 2018	Dec. 29, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, Net	$ 212.9	$ 174.0	[1]
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, Net	170.1	131.7
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, Net	34.2	33.1
Asia Pacific And Other Non-US Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, Net	$ 8.6	$ 9.2

[1] See Note 2 for a summary of adjustments