Supplemental Stockholders' Equity Information - Reclassifications out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 29, 2013		Sep. 23, 2012	Sep. 29, 2013		Sep. 23, 2012
Reclassification out of accumulated other comprehensive income (loss):
(Loss)/income from continuing operations	$ (5,300)		$ (2,979)	$ 18,170		$ 45,632
Income tax expense	2,578		(3,187)	21,473		28,446
Funded Status of Benefit Plans [Member] | Reclassification out of accumulated other comprehensive income (loss) [Member]
Reclassification out of accumulated other comprehensive income (loss):
Amortization of prior service credit(1)	(4,179)	[1]		(12,537)	[1]
Recognized actuarial loss(1)	10,776	[1]		32,328	[1]
(Loss)/income from continuing operations	6,597			19,791
Income tax expense	4,196			9,648
Total reclassification, net of tax	$ 2,401			$ 10,143

[1] These items are included in the components of net periodic benefit cost for pension and other retirement benefits. See Note 9 for additional information.