Summary of Significant Accounting Policies (Share-Based Compensation Classified, in Condensed Consolidated Interim Financial Statements) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Sep. 24, 2011	Sep. 29, 2012	Sep. 24, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	$ 959	$ 923	$ 3,254	$ 2,909
Income tax benefit
Total share-based compensation, net of tax	959	923	3,254	2,909
Cost of sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	49	101	279	283
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	291	262	951	864
Selling, general and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation	$ 619	$ 560	$ 2,024	$ 1,762