Reporting Segment And Geographic Information (Schedule Of Long-Lived Assets) (Details) - USD ($) $ in Millions	Dec. 30, 2016	Jan. 01, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, Net	$ 144.2	$ 159.2
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, Net	120.4	130.4
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, Net	15.3	18.9
Asia Pacific And Other Non-US Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, Net	$ 8.5	$ 9.9