Earnings Per Share (Details) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Earnings Per Share Reconciliation [Abstract]
Net income	$ 101,257	$ 94,719	$ 295,821	$ 255,159
Net income per basic common share	$ 1.12	$ 1.03	$ 3.24	$ 2.75
Net income per diluted common share	$ 1.10	$ 1.02	$ 3.18	$ 2.71
Weighted-average number of basic common shares	90,688,000	91,714,000	91,334,000	92,647,000
Effect of dilutive stock option, restricted stock and restricted stock unit securities	1,372,000	1,572,000	1,564,000	1,624,000
Weighted-average number of diluted common shares and equivalents	92,060,000	93,286,000	92,898,000	94,271,000
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	700,000	1,800,000	700,000	1,800,000