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Shareholders' Equity Shareholders' Equity Ordinary Shares Activity (Details)
9 Months Ended
Sep. 26, 2014
Sep. 27, 2013
Shareholders' Equity [Abstract]    
Stock option exercises 1,417,263 1,844,527
Restricted stock grants 26,117 26,201
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 232,772 0
Ordinary shares repurchase and retirement (1,529,176) (3,462,506)