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Shareholders' Equity Shareholders' Equity Ordinary Shares Activity (Details)
6 Months Ended
Jun. 27, 2014
Jun. 28, 2013
Shareholders' Equity [Abstract]    
Stock option exercises 378,994 903,501
Restricted stock grants 26,117 26,201
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 170,572 0
Ordinary shares repurchase and retirement (1,312,771) (3,424,609)