CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance at Dec. 26, 2010	$ 1,078,596	$ 2,143	$ 1,442,810	$ (348,653)	$ (23,637)	$ 5,933
Balance, shares at Dec. 26, 2010		214,282
Comprehensive income (loss):
Net income (loss)	(495,690)			(496,772)		1,082
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) on available-for-sale securities, net of tax	(1,160)				(1,160)
Gains (losses) associated with pension and other postretirement benefits, net of tax	(21,273)				(21,273)
Total other comprehensive income (loss)	(22,433)
Comprehensive income (loss)	(518,123)
Other activity	(2,610)		107	1,480		(4,197)
Share-based compensation plans:
Requisite service period recognition	567		567
Tax benefit related to share-based compensation
Balance at Dec. 25, 2011	558,430	2,143	1,443,484	(843,945)	(46,070)	2,818
Balance, shares at Dec. 25, 2011		214,282
Comprehensive income (loss):
Net income (loss)	174,042			174,234		(192)
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) on available-for-sale securities, net of tax	(12)				(12)
Gains (losses) associated with pension and other postretirement benefits, net of tax	(22,429)				(22,429)
Total other comprehensive income (loss)	(22,441)
Comprehensive income (loss)	151,601
Issuance of common stock	198,281	444	197,837
Issuance of common stock (in shares)		44,444
Share-based compensation plans:
Common stock issued under compensation plans	3	3
Common stock issued under compensation plans (in shares)		273
Requisite service period recognition	682		682
Tax benefit related to share-based compensation
Balance at Dec. 30, 2012	908,997	2,590	1,642,003	(669,711)	(68,511)	2,626
Balance, shares at Dec. 30, 2012		258,999
Comprehensive income (loss):
Net income (loss)	549,713			549,555		158
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) on available-for-sale securities, net of tax	62				62
Gains (losses) associated with pension and other postretirement benefits, net of tax	22,714				22,714
Total other comprehensive income (loss)	22,776
Comprehensive income (loss)	572,489
Share-based compensation plans:
Common stock issued under compensation plans
Common stock issued under compensation plans (in shares)		30
Requisite service period recognition	3,345		3,345
Tax benefit related to share-based compensation	7,770		7,771
Balance at Dec. 29, 2013	$ 1,492,602	$ 2,590	$ 1,653,119	$ (120,156)	$ (45,735)	$ 2,784
Balance, shares at Dec. 29, 2013		259,029