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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2015	Jun. 27, 2014	Jun. 26, 2015	Jun. 27, 2014
Earnings Per Share Details [Abstract]
Net earnings available to common shareholders	$ 172,637	$ 66,236	$ 241,478	$ 116,981
Weighted average shares outstanding for basic earnings per share	58,235	60,453	58,608	60,637
Dilutive effect of stock options computed using the treasury stock method and the average market price	1,387	1,575	1,436	1,596
Weighted average shares outstanding for diluted earnings per share	59,622	62,028	60,044	62,233
Basic Net Earnings per Common Share	$ 2.96	$ 1.10	$ 4.12	$ 1.93
Diluted Net Earnings per Common Share	$ 2.90	$ 1.07	$ 4.02	$ 1.88
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount			1,357	876

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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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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