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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Earnings Per Share Reconciliation [Abstract]
Net income	$ 124,856	$ 116,281	$ 347,125	$ 317,999
Net income per basic common share	$ 1.55	$ 1.42	$ 4.29	$ 3.85
Effect of dilutive stock option, restricted stock and restricted stock unit securities on earnings per share	(0.02)	(0.02)	(0.03)	(0.03)
Net income per diluted common share	$ 1.53	$ 1.40	$ 4.26	$ 3.82
Weighted-average number of basic common shares	80,677	82,036	80,923	82,552
Effect of dilutive stock option, restricted stock and restricted stock unit securities on shares outstanding	711	748	650	753
Weighted-average number of diluted common shares and equivalents	81,388	82,784	81,573	83,305
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	500	600	800	700

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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