Note 5. Equity Incentive Plan and Stock-Based Compensation (Detail) - Shares Available for Grant
3 Months Ended
Mar. 31, 2013
Dec. 30, 2012
Balance 2,719,129 1,103,450
Additional shares issuable under 2010 Plan (annual increase for 2013) 2,577,033  
Stock Options [Member]
   
Stock options granted, net of forfeitures/cancellations (381,869)  
Restricted Stock Units (RSUs) [Member]
   
Awards granted, net of forfeitures/cancellations (203,485)  
Performance Stock Units [Member]
   
Awards granted, net of forfeitures/cancellations (376,000)