Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Earnings Per Share, Diluted [Line Items]
Net income attributable to shareholders		$ 109,244	$ 146,864	$ 339,234	$ 381,868
Weighted average shares outstanding - basic		94,302	98,631	95,277	99,336
Net effect of various dilutive stock-based compensation awards		1,061	1,235	1,025	1,273
Weighted average shares outstanding - diluted		95,363	99,866	96,302	100,609
Net income per share:
Basic		$ 1.16	$ 1.49	$ 3.56	$ 3.84
Diluted	[1]	$ 1.15	$ 1.47	$ 3.52	$ 3.80
Stock Compensation Plan [Member]
Net income per share:
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		759	317	656	271

[1] Stock-based compensation awards for the issuance of 759 and 656 shares for the third quarter and first nine months of 2015 and 317 and 271 shares for the third quarter and first nine months of 2014, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.