Supplemental Stockholders' Equity Information - Changes in 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
Changes in accumulated other comprehensive income (loss):
Balance, beginning of period			$ (512,566)
Other comprehensive income before reclassifications, before tax			4,067
Amounts reclassified from accumulated other comprehensive loss, before tax			19,792
Income tax expense	4,196	2,539	9,648	732
Other comprehensive income, net of tax	6,684	4,191	14,211	1,870
Balance, end of period	(498,355)		(498,355)
Foreign Currency Translation Adjustments [Member]
Changes in accumulated other comprehensive income (loss):
Balance, beginning of period			11,327
Other comprehensive income before reclassifications, before tax			1,497
Amounts reclassified from accumulated other comprehensive loss, before tax			0
Income tax expense			717
Other comprehensive income, net of tax			780
Balance, end of period	12,107		12,107
Unrealized Loss on Available-For-Sale Security [Member]
Changes in accumulated other comprehensive income (loss):
Balance, beginning of period			(431)
Other comprehensive income before reclassifications, before tax			908
Amounts reclassified from accumulated other comprehensive loss, before tax			0
Income tax expense			363
Other comprehensive income, net of tax			545
Balance, end of period	114		114
Funded Status of Benefit Plans [Member]
Changes in accumulated other comprehensive income (loss):
Balance, beginning of period			(523,462)
Other comprehensive income before reclassifications, before tax			1,662
Amounts reclassified from accumulated other comprehensive loss, before tax			19,792
Income tax expense			8,568
Other comprehensive income, net of tax			12,886
Balance, end of period	$ (510,576)		$ (510,576)