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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 26, 2011	Jun. 27, 2010	Jun. 26, 2011	Jun. 27, 2010
Income Tax Disclosure [Abstract]
Income tax (benefit)/expense	$ (16,615)	$ 25,435	$ (15,209)	$ 52,462
Effective tax rate, continuing operations	12.20%	44.60%	11.70%	53.40%
(Loss)/income from continuing operations before income taxes	(136,438)	57,017	(129,806)	98,202
Tax charge for reduction in future tax benefits for certain retiree health benefits				$ 10,900

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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