Net Income Per Share (Details) (USD $) In Thousands, except 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, Basic [Abstract]
Net income, basic	$ 76,603	$ 64,767	$ 258,823	$ 232,353
Weighted average number of shares outstanding, basic	137,367,000	139,524,000	138,293,000	139,304,000
Net income per share - basic (in dollars per share)	$ 0.56	$ 0.46	$ 1.87	$ 1.67
Earnings Per Share, Diluted [Abstract]
Net income, dilutive	76,603	64,767	258,823	232,353
Weighted average number of shares outstanding, diluted	138,863,000	141,726,000	140,002,000	141,689,000
Net income per share - diluted (in dollars per share)	$ 0.55	$ 0.46	$ 1.85	$ 1.64
Dilutive stock options and restricted stock units outstanding, income	$ 0	$ 0	$ 0	$ 0
Dilutive stock options and restricted stock units outstanding, per share (in shares)	1,496,000	2,202,000	1,709,000	2,385,000
Dilutive stock options and restricted stock units outstanding, per share (in dollars per share)	$ (0.01)	$ 0.00	$ (0.02)	$ (0.03)
Antidilutive securities excluded from computation of earnings per share, amount	1,400,000	700,000	1,100,000	1,200,000