Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Earnings Per Share, Diluted [Line Items]
Net income attributable to shareholders		$ 123,932	$ 127,884	$ 229,990	$ 235,004
Weighted average shares outstanding - basic		95,638	99,449	95,776	99,695
Net effect of various dilutive stock-based compensation awards		1,011	1,113	1,098	1,285
Weighted average shares outstanding - diluted		96,649	100,562	96,874	100,980
Net income per share:
Basic		$ 1.30	$ 1.29	$ 2.40	$ 2.36
Diluted	[1]	$ 1.28	$ 1.27	$ 2.37	$ 2.33
Stock Compensation Plan [Member]
Net income per share:
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		709	316	607	241

[1] Stock-based compensation awards for the issuance of 709 and 607 shares for the second quarter and first six months of 2015 and 316 and 241 shares for the second quarter and first six months of 2014, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.