Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Earnings Per Share, Diluted [Line Items]
Net income attributable to shareholders		$ 99,679	$ 134,270	$ 213,447	$ 240,505
Weighted average shares outstanding - basic		88,876	91,782	89,079	91,647
Net effect of various dilutive stock-based compensation awards		961	911	1,067	1,124
Weighted average shares outstanding - diluted		89,837	92,693	90,146	92,771
Net income per share:
Basic		$ 1.12	$ 1.46	$ 2.40	$ 2.62
Diluted	[1]	$ 1.11	$ 1.45	$ 2.37	$ 2.59
Stock Compensation Plan [Member]
Net income per share:
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		432	848	328	987

[1] Stock-based compensation awards for the issuance of 432 and 328 shares for the second quarter and first six months of 2017 and 848 and 987 shares for the second quarter and first six months 2016, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.