Shareholders' Equity - Ordinary Shares Activity (Details) - shares	6 Months Ended
Jun. 29, 2018	Jun. 30, 2017
Stockholders' Equity Note [Abstract]
Stock option exercises (shares)	36,500	6,500
Restricted stock grants (shares)	21,304	14,294
Restricted and performance stock units (shares)	180,254	137,287
Ordinary shares repurchased and retired (shares)	(218,232)	(1,310,900)

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

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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- Definition

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

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-Publisher FASB
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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