Income Taxes Narratives (Details) (USD $)	3 Months Ended
Apr. 30, 2012	Apr. 30, 2011	Jan. 31, 2012
Income Tax Disclosure [Abstract]
Income tax provision	$ (20,151,000)	$ (7,425,000)
Effective tax rate	(79.20%)	(14.90%)
Unrecognized tax benefits, if recognized would impact effective tax rate	130,800,000
Amount unrecognized tax benefits could decrease in the next twelce months as a result of settlement of certain tax audits or lapses of statutes of limitation	6,500,000
Accrued interest and penalties	$ 53,600,000		$ 54,800,000

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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