Net Income per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 27, 2014		Sep. 28, 2013		Sep. 27, 2014		Sep. 28, 2013
Earnings Per Share, Diluted [Line Items]
Net income attributable to shareholders	$ 146,864		$ 96,779		$ 381,868		$ 264,589
Weighted average shares outstanding - basic	98,631		100,750		99,336		103,269
Net effect of various dilutive stock-based compensation awards	1,235		919		1,273		1,157
Weighted average shares outstanding - diluted	99,866		101,669		100,609		104,426
Net income per share:
Basic	$ 1.49		$ 0.96		$ 3.84		$ 2.56
Diluted	$ 1.47	[1]	$ 0.95	[1]	$ 3.80	[1]	$ 2.53	[1]
Stock Compensation Plan [Member]
Net income per share:
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	317		831		271		871

[1] Stock-based compensation awards for the issuance of 317 and 271 shares for the third quarter and first nine months of 2014 and 831 and 871 for the third quarter and first nine months of 2013, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.