Shareholders' Equity Shareholders' Equity Ordinary Shares Activity (Details)	3 Months Ended
Mar. 29, 2013	Mar. 30, 2012
Class of Stock [Line Items]
Stock option exercises	589,018	40,250
Restricted share grants	26,201	27,573
Ordinary shares repurchase and retirement	(1,038,209)	0

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

Number of share options (or share units) exercised during the current period.

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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