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Discontinued Operations - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	May 06, 2011	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date of completion of sale of business				May 06, 2011
Cash consideration received for sale of ESG business	$ 480,000,000
Income from discontinued operations		0	(2,311,000)	0	254,673,000
Restructuring expenses related to the exit of the ESG business			3,000,000		40,900,000
Released deferred tax liabilities related to sale of external storage systems business			$ 19,700,000		$ 19,700,000

Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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