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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Earnings Per Share Reconciliation [Abstract]
Net income	$ 128,217	$ 105,657	$ 222,269	$ 201,718
Net income per basic common share	$ 1.59	$ 1.28	$ 2.74	$ 2.44
Effect of dilutive stock option, restricted stock and restricted stock unit securities on earnings per share	(0.02)	(0.01)	(0.02)	(0.03)
Net income per diluted common share	$ 1.57	$ 1.27	$ 2.72	$ 2.41
Weighted-average number of basic common shares	80,804	82,564	81,043	82,798
Effect of dilutive stock option, restricted stock and restricted stock unit securities on shares outstanding	651	768	620	753
Weighted-average number of diluted common shares and equivalents	81,455	83,332	81,663	83,551
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	800	500	1,200	600

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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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