Note 7. Equity Incentive Plan and Stock-based Compensation (Details) - Key Executive Restricted Stock Unit and Performance Stock Unit Award Activities (USD $)
 12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Dec. 25, 2011
Key Executive Rsu [Member]        
Note 7. Equity Incentive Plan and Stock-based Compensation (Details) - Key Executive Restricted Stock Unit and Performance Stock Unit Award Activities [Line Items]        
Shares, unvested 297,635 974,286 1,792,171 969,956
Amount, unvested $ 15.15 $ 12.40 $ 12.02 $ 13.71
Shares, granted     1,100,222  
Amount, granted     $ 10.04  
Shares, forfeited (357,870) (36,836)    
Amount, forfeited $ 11.03 $ 12.53    
Shares, vested (318,781) (781,049) (278,007)  
Amount, vested $ 11.37 $ 11.52 $ 10.06  
Performance Stock Units [Member]        
Note 7. Equity Incentive Plan and Stock-based Compensation (Details) - Key Executive Restricted Stock Unit and Performance Stock Unit Award Activities [Line Items]        
Shares, unvested 1,060,804 362,000    
Amount, unvested $ 18.23 $ 7.38    
Shares, granted 888,804 406,000    
Amount, granted $ 20.34 $ 7.38    
Shares, forfeited (18,000) (44,000)    
Amount, forfeited $ 7.40 $ 7.40    
Shares, vested (172,000)      
Amount, vested $ 7.40