Business Combinations (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended					3 Months Ended	12 Months Ended
	Jan. 01, 2010	Dec. 30, 2011 WiChorus Acquistion [Member]	Jan. 01, 2010 WiChorus Acquistion [Member] years	Dec. 30, 2011 Post-Acquisition [Member]	Dec. 30, 2011 IPR&D [Member]	Sep. 30, 2011 Broadband Segment [Member]	Dec. 30, 2011 Broadband Segment [Member]
Business Acquisition [Line Items]
Acquisition date		December 1, 2009
Cash paid to stockholders in business acquisition			$ 180.0
Percent of capital stock acquired			100.00%
Cash balance of acquired business			15.3
Business acquisition, purchase price net of cash			164.7
Goodwill, acquired during period			82.7
Acquired finite lived intangible assets			83.6
Weighted average amortization period, years			5
Acquisition costs			1.3
Stock options issued to stockholders in acquisition			628,517
Weighted average remaining vested period of stock option issued in business acquisition, years			1.5
Fair value of options issued in business acquisition	3.3		2.0	1.3
Impairment charges of indefinite lives intangible assets					20.0
Impairment charges on goodwill						$ 82.7	$ 82.7