Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended		12 Months Ended									3 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010	Aug. 30, 2011 IPR&D	Mar. 30, 2012 Accelerated amortization of intangible assets	Dec. 28, 2012 Accelerated amortization of intangible assets	Dec. 28, 2012 Trade Names/Trademarks Minimum	Dec. 28, 2012 Trade Names/Trademarks Maximum	Dec. 28, 2012 Customer Relationship Minimum	Dec. 28, 2012 Customer Relationship Maximum	Dec. 28, 2012 Non-compete arrangements Minimum	Dec. 28, 2012 Non-compete arrangements Maximum	Dec. 28, 2012 Developed technology Minimum	Dec. 28, 2012 Developed technology Maximum	Sep. 30, 2011 Broadband Segment	Dec. 28, 2012 Services	Dec. 30, 2011 Services	Dec. 31, 2010 Services
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 122.1	$ 122.0	$ 204.9													$ 122.1	$ 122.0	$ 122.2
Goodwill impairment charge															82.7
Finite-lived intangible assets, useful life							4 months	12 months	6 months	9 years	1 year 6 months	3 years	2 years	7 years 6 months
Restructuring Expense	119.0	20.3	9.5		47.7	47.7
IPR&D impairment charge				20.0
Intangible assets, amortization period	2015
Intangible assets, estimated amortization for 2013	4.2
Intangible assets, estimated amortization for 2014	0.1
Intangible assets, estimated amortization for 2015	$ 0.1