Restructuring And Other Charges (July 2009 And February 2009 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 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
July 2009 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		(1.3)
Cumulative pretax restructuring charges incurred to date		5.1
Cumulative cash payments		6.1
July 2009 Restructuring Plan [Member] | Severance And Other Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Expected total cash payments		6.7
Restructuring expense		0.6
Cumulative pretax restructuring charges incurred to date		6.6
July 2009 Restructuring Plan [Member] | Facility- And Asset-Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		(1.9)
Cumulative pretax restructuring charges incurred to date		(1.5)
July 2009 Restructuring Plan [Member] | Broadband Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		1.6
July 2009 Restructuring Plan [Member] | Transport Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		1.2
July 2009 Restructuring Plan [Member] | Services Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		2.3
February 2009 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Expected workforce reductions, number of employees		49
February 2009 Restructuring Plan [Member] | Severance And Other Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative cash payments		1.7
February 2009 Restructuring Plan [Member] | Broadband Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		0.8
February 2009 Restructuring Plan [Member] | Transport Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		0.8
February 2009 Restructuring Plan [Member] | Services Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date		0.1
Previous 2009 Restructuring Plans [Member] | Facility- And Asset-Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 1.1