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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	500	600	600	600
Earnings Per Share Reconciliation [Abstract]
Net income	$ 105,657	$ 96,529	$ 201,718	$ 166,831
Net income per basic common share	$ 1.28	$ 1.14	$ 2.44	$ 1.97
Effect of dilutive stock option, restricted stock and restricted stock unit securities	(0.01)	(0.01)	(0.03)	(0.02)
Net income per diluted common share	$ 1.27	$ 1.13	$ 2.41	$ 1.95
Weighted-average number of basic common shares	82,564	84,462	82,798	84,731
Effect of dilutive stock option, restricted stock and restricted stock unit securities on shares outstanding	768	715	753	807
Weighted-average number of diluted common shares and equivalents	83,332	85,177	83,551	85,538

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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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