Stockholders' Equity Changes in Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended					12 Months Ended
	Mar. 31, 2013	Dec. 30, 2012	Sep. 23, 2012	Jun. 24, 2012	Mar. 25, 2012	Dec. 29, 2013	Dec. 30, 2012	Dec. 25, 2011
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	$ (512,566)	$ (495,184)	$ (499,375)	$ (496,702)		$ (512,566)		$ 14,500
Income tax expense(1)	1,780	(11,492)	2,539	(1,647)	(160)	73,165	(10,760)	(86,065)
Other comprehensive (loss)/income, net of tax	2,628	(17,382)	4,191	(2,673)	352	110,517	(15,512)	(124,908)
Balance, ending	(509,938)	(512,566)	(495,184)	(499,375)	(496,702)	(402,611)	(512,566)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	11,327					11,327
Other comprehensive income before reclassifications, before tax(1)						2,613
Amounts reclassified from accumulated other comprehensive loss, before tax(1)						0
Income tax expense(1)						1,266
Other comprehensive (loss)/income, net of tax						1,347
Balance, ending						12,674
Unrealized Loss on Available-For-Sale Security [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	(431)					(431)
Other comprehensive income before reclassifications, before tax(1)						0
Amounts reclassified from accumulated other comprehensive loss, before tax(1)						729
Income tax expense(1)						298
Other comprehensive (loss)/income, net of tax						431
Balance, ending						0
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	(523,462)					(523,462)
Other comprehensive income before reclassifications, before tax(1)						197,081
Amounts reclassified from accumulated other comprehensive loss, before tax(1)						(17,303)
Income tax expense(1)						71,601
Other comprehensive (loss)/income, net of tax						108,177
Balance, ending						(415,285)
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning	(512,566)					(512,566)
Other comprehensive income before reclassifications, before tax(1)						199,694
Amounts reclassified from accumulated other comprehensive loss, before tax(1)						(16,574)
Income tax expense(1)						73,165
Other comprehensive (loss)/income, net of tax						109,955	(15,508)	(124,463)
Balance, ending		$ (512,566)				$ (402,611)	$ (512,566)