Reporting Segment And Geographic Information (Schedule Of Revenue From Customers) (Details) - USD ($)		3 Months Ended								12 Months Ended
		Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Dec. 30, 2016		Jan. 01, 2016		Jan. 02, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		$ 585,500,000	$ 584,100,000	$ 609,600,000	$ 583,000,000	$ 559,700,000	$ 562,300,000	$ 585,800,000	$ 582,600,000	$ 2,362,200,000	[1]	$ 2,290,400,000	[1]	$ 2,395,500,000	[1]
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]									1,156,000,000		1,142,100,000		1,147,700,000
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]									574,900,000		557,200,000		581,700,000
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]									352,600,000		321,100,000		345,600,000
Other Non-US Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]									278,700,000		270,000,000		320,500,000
Advanced Devices [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues										$ 134,600,000		131,500,000		138,500,000
Advanced Devices [Member] | Sales Revenue, Net [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage										10.00%
Ten Percent Customer member [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues										$ 0		$ 0		$ 0
Ten Percent Customer member [Member] | Sales Revenue, Net [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage										10.00%		10.00%		10.00%
Ten Percent Accounts Receivable member [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues										$ 0		$ 0
Ten Percent Accounts Receivable member [Member] | Accounts Receivable [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage										10.00%		10.00%

[1] Revenue is attributed to countries based on the location of the customer.