Note 7. Equity Incentive Plan and Stock-based Compensation (Details) - Total Recorded Stock-based Compensation Expense (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense after income taxes (1) $ 40,266 [1] $ 30,687 [1] $ 34,363 [1]
Cost of Sales [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense before income taxes 7,961 5,900 6,790
Research and Development Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense before income taxes 10,604 9,340 8,696
Selling, General and Administrative Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense before income taxes $ 21,701 $ 15,447 $ 18,877
[1] There was no income tax benefit related to stock-based compensation because all of the Company's U.S. deferred tax assets, net of U.S. deferred tax liabilities, continue to be subject to a full valuation allowance.