Restructuring And Other Charges (Narrative) (Details) (USD $) In Millions	3 Months Ended	6 Months Ended						3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended							3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
	Jul. 02, 2010	Jul. 01, 2011	Jul. 02, 2010	Jul. 01, 2011 January 2010 Restructuring Plan [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Broadband Segment [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Transport Segment [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Services Segment [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Severance And Other Termination Benefits [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Severance And Other Termination Benefits [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Facility- And Asset-Related Charges [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member] Broadband Segment [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member] Transport Segment [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member] Services Segment [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member] Severance And Other Termination Benefits [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member] Facility- And Asset-Related Charges [Member]	Jul. 01, 2011 Restructuring Plans Prior To 2009 [Member] Facility- And Asset-Related Charges [Member]	Jul. 02, 2010 Severance And Other Termination Benefits [Member]	Jul. 01, 2011 Severance And Other Termination Benefits [Member]	Jul. 02, 2010 Severance And Other Termination Benefits [Member]	Jul. 02, 2010 Facility- And Asset-Related Charges [Member]	Jul. 01, 2011 Facility- And Asset-Related Charges [Member]	Jul. 02, 2010 Facility- And Asset-Related Charges [Member]
Restructuring expense	$ (0.5)	$ 1.0	$ 9.5					$ 0.1	$ 0.6		$ 0.1					$ 0.6		$ (0.2)	$ (0.5)	$ 1.2	$ 7.1		$ (0.2)	$ 2.4
Cumulative pretax restructuring charges incurred to date				9.6	6.1	3.2	0.3		7.0	2.6		7.0	2.6	2.1	2.3	6.6	0.4
Expected total cash payments				7.0												6.7
Cumulative cash payments				$ 5.9												$ 5.9