Goodwill and Identified Intangibles (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Amortization expense for identifiable purchased intangible assets
Total amortization expense	$ 7,238	$ 7,721	$ 14,777	$ 15,092
Cost of revenue [Member]
Amortization expense for identifiable purchased intangible assets
Total amortization expense	5,048	5,491	10,408	10,633
Operating expenses [Member]
Amortization expense for identifiable purchased intangible assets
Total amortization expense	$ 2,190	$ 2,230	$ 4,369	$ 4,459