Restructuring And Other Charges (July 2011 And January 2010 Restructuring Plan) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Jan. 30, 2012	Dec. 30, 2011	Dec. 31, 2010	Jan. 01, 2010
Restructuring Cost and Reserve [Line Items]
Expected total cash payments	$ 31.0
Expected pretax charges	107
Expected workforce reductions, number of employees	530
Restructuring expense		20.3	9.5	11.7
Severance And Other Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		15.9	6.9	6.6
Other Obligations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		0.6
July 2011 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Expected total cash payments		17.0
Expected pretax charges		22
Expected workforce reductions, number of employees		330
Restructuring expense		19.7
July 2011 Restructuring Plan [Member] | Severance And Other Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Expected pretax charges		14
Restructuring expense		14.5
July 2011 Restructuring Plan [Member] | Facility- And Asset-Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Expected pretax charges		8
Restructuring expense		4.6
July 2011 Restructuring Plan [Member] | Other Obligations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		0.6
July 2011 Restructuring Plan [Member] | Broadband Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		10.4
July 2011 Restructuring Plan [Member] | Transport Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		5.3
July 2011 Restructuring Plan [Member] | Services Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		4.0
January 2010 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Expected total cash payments		7.2
Cumulative pretax restructuring charges incurred to date		9.8
Cumulative cash payments		6.9
January 2010 Restructuring Plan [Member] | Severance And Other Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		0.8
Cumulative pretax restructuring charges incurred to date		7.2
January 2010 Restructuring Plan [Member] | Facility- And Asset-Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		2.6
January 2010 Restructuring Plan [Member] | Broadband Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		6.2
January 2010 Restructuring Plan [Member] | Transport Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		3.3
January 2010 Restructuring Plan [Member] | Services Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		$ 0.3