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Taxes (Details)
3 Months Ended
Apr. 01, 2012
Apr. 03, 2011
Reconciliation of the United States federal statutory corporate tax rate to the Company's effective tax rate or income tax provision    
Income tax at federal statutory rate 35.00% 35.00%
State income taxes, net of federal benefit 1.00% 1.00%
Foreign tax rate differential (15.00%) (13.00%)
Income tax provision 21.00% 23.00%