Note 5. Balance Sheet Components (Details) (USD $)
1 Months Ended 12 Months Ended 1 Months Ended
Jan. 23, 2014
sqft
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
May 22, 2014
Note 5. Balance Sheet Components (Details) [Line Items]          
Depreciation   $ 58,000,000 $ 51,600,000 $ 67,300,000  
Cash, Cash Equivalents, and Short-term Investments   300,700,000 311,500,000    
Sale Leaseback Transaction, Net Proceeds, Financing Activities 59,000,000 58,974,000      
Sale Leaseback Transaction Area Subject To Lease (in Square Feet) 170,000        
Rent Free Period 6 months        
Land Disposal [Member]          
Note 5. Balance Sheet Components (Details) [Line Items]          
Area of Land (in Acres) 24.5        
Buildings Disposed [Member]          
Note 5. Balance Sheet Components (Details) [Line Items]          
Area of Real Estate Property (in Square Feet) 471,000        
Ridder Park Drive [Member]          
Note 5. Balance Sheet Components (Details) [Line Items]          
Lessee Leasing Arrangements, Operating Leases, Term of Contract         12 years
Lessee Leasing Arrangements, Operating Leases, Renewal Term         5 years
Cash Available Inside the USA [Member]          
Note 5. Balance Sheet Components (Details) [Line Items]          
Cash, Cash Equivalents, and Short-term Investments   288,800,000 298,300,000    
Outside The United States Of America [Member]          
Note 5. Balance Sheet Components (Details) [Line Items]          
Cash, Cash Equivalents, and Short-term Investments   $ 11,900,000 $ 13,200,000