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Shareholders' Equity Shareholders' Equity Ordinary Shares Activity (Details)
3 Months Ended
Mar. 27, 2015
Mar. 28, 2014
Shareholders' Equity [Abstract]    
Stock option exercises 610,896us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 117,034us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Restricted stock grants 21,875us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 26,117us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 128,253us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation 61,606us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Ordinary shares repurchase and retirement (2,056,604)us-gaap_StockRepurchasedDuringPeriodShares (764,600)us-gaap_StockRepurchasedDuringPeriodShares