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Shareholders' Equity Shareholders' Equity Ordinary Shares Activity (Details) - shares
6 Months Ended
Jun. 26, 2015
Jun. 27, 2014
Shareholders' Equity [Abstract]    
Stock option exercises 698,373 378,994
Restricted stock grants 21,875 26,117
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 128,999 170,572
Ordinary shares repurchase and retirement (2,056,604) (1,312,771)