Supplemental Stockholders' Equity Information - Reclassifications out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended							6 Months Ended			12 Months Ended
	Jun. 30, 2013		Mar. 31, 2013	Dec. 30, 2012	Sep. 23, 2012	Jun. 24, 2012	Mar. 25, 2012	Jun. 30, 2013		Jun. 24, 2012	Dec. 30, 2012	Dec. 25, 2011
Reclassification out of accumulated other comprehensive income (loss):
Income from continuing operations	$ 20,137		$ 3,323	$ 118,599	$ (3,302)	$ 38,040	$ 9,159	$ 23,460		$ 47,199	$ 162,496	$ 53,316
Income tax expense	18,189		3,328	76,497	(2,396)	29,440	1,793	21,516		31,233	105,334	32,810
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)	(4,178)	[1]						(8,358)	[1]
Recognized actuarial loss(1)	10,776	[1]						21,553	[1]
Income from continuing operations	6,598							13,195
Income tax expense	3,672							5,452
Total reclassification, net of tax	$ 2,926							$ 7,743

[1] These items are included in the components of net periodic benefit cost for pension and other retirement benefits. See Note 10 for additional information.