Shareholders' Equity - Ordinary Shares Activity (Details) - shares	6 Months Ended
Jun. 30, 2017	Jul. 01, 2016
Stockholders' Equity Note [Abstract]
Stock option exercises (shares)	6,500	163,467
Restricted stock grants (shares)	14,294	22,946
Restricted and performance stock units (shares)	137,287	177,054
Ordinary shares repurchased and retired (shares)	(1,310,900)	(1,672,535)

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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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.

+ References

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-Subparagraph (SX 210.5-02(29))
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- Definition

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

+ References

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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

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