Discontinued Operations (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	May 06, 2011	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
(Loss)/income from discontinued operations for the external storage systems business
Revenues			$ 51,675,000		$ 207,365,000
Loss before gain on sale of external storage systems business and income taxes			(14,590,000)		(22,500,000)
Gain on sale of external storage systems business			260,066,000		260,066,000
Benefit from income taxes			(19,900,000)		(19,418,000)
Income from discontinued operations		0	265,376,000	0	256,984,000
Discontinued Operations (Textual) [Abstract]
Cash consideration received for sale of ESG business	480,000,000
Date of completion of sale of business				May 06, 2011
Income from discontinued operations		0	265,376,000	0	256,984,000
Restructuring expenses related to the exit of the ESG business			14,100,000		37,900,000
Released deferred tax liabilities related to sale of external storage systems business			$ 19,700,000		$ 19,700,000