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Taxes - Reconciliation of United States Federal Statutory Corporate Tax Rate to Company's Effective Tax Rate, or Income Tax Provision (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Jul. 01, 2012
Reconciliation of United States federal statutory corporate tax rate to Company's effective tax rate or income tax provision        
Income tax at federal statutory rate 35.00% 35.00% 35.00% 35.00%
State income taxes, net of federal benefit 2.00% 1.00% 2.00% 1.00%
Foreign tax rate differential (17.00%) (15.00%) (17.00%) (15.00%)
2013 research and development credit (1.00%)   (1.00%)  
Discrete event- 2012 research and development credit     (1.00%)  
Income tax provision 19.00% 21.00% 18.00% 21.00%