Goodwill and Identified Intangibles (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Amortization expense for identifiable purchased intangible assets
Total amortization expense	$ 7,539	$ 7,371
Cost of revenue [Member]
Amortization expense for identifiable purchased intangible assets
Total amortization expense	5,360	5,142
Operating expenses [Member]
Amortization expense for identifiable purchased intangible assets
Total amortization expense	$ 2,179	$ 2,229