Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended										6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012		Dec. 31, 2011		Oct. 02, 2011	Jul. 03, 2011	Apr. 03, 2011	Jul. 01, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net loss	$ (4,800)	$ 7,689	$ (43,302)	$ (242,100)	[1]	$ (21,600)	[2]	$ 700	$ (3,800)	$ (6,000)	$ (285,392)	$ (277,703)	$ (282,503)	$ (30,757)	$ (5,325)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments													1,873	(5,967)	(2,610)
Unrealized gain (loss) on investments													38	(34)	37
Pension adjustments													(9,378)	(19,359)	(11,860)
Total other comprehensive loss, net of tax													(7,467)	(25,360)	(14,433)
Total comprehensive loss, net of tax		$ 8,560	$ (50,959)								$ (291,656)	$ (283,096)	$ (289,970)	$ (56,117)	$ (19,758)

[1] In the first quarter of 2012, we recognized expense of $206.9 million for a valuation allowance against a portion of our U.S. deferred tax assets.

[2] In the fourth quarter of 2011, we recorded an expense of $20.9 million for a valuation allowance against a portion of our U.S. deferred tax assets.