Shareholders' Equity - Ordinary Shares Activity (Details) - shares	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Stockholders' Equity Note [Abstract]
Stock option exercises (shares)	17,500	6,500
Restricted stock grants (shares)	21,304	14,294
Restricted and performance stock units (shares)	159,632	130,682
Ordinary shares repurchased and retired (shares)	(182,013)	(303,300)