Restructuring and Excess Facilities (Details Textuals) (USD $) In Millions	6 Months Ended	3 Months Ended
	Jul. 01, 2011	Jul. 03, 2009 Scopus acquisition [Member] Selling, general and administrative expenses [Member]	Dec. 31, 2010 Omneon [Member] Selling, general and administrative expenses [Member]	Apr. 01, 2011 Selling, general and administrative expenses [Member]	Jul. 01, 2011 Accrued Liabilities Current [Member]
Restructuring and Excess Facilities (Textuals) [Abstract]
Expenses related to business acquisition		$ 0.3	$ 3.0
Expected sublease income				0.5
Accrued excess facilities cost	3.5				1.7
Additional Restructuring and Excess Facilities (Textuals) [Abstract]
Lease payments, property taxes, insurance and other maintenance fees related to vacated facilities	1.0
Sublease income related to vacated facilities	$ 1.1