The cumulative amount of all deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A taxable temporary difference is a difference between the tax basis and the carrying amount of an asset or liability in the financial statements prepared in accordance with generally accepted accounting principles that will result in taxable amounts in one or more future periods.

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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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- Definition

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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Income Taxes Narratives (Details) (USD $)	3 Months Ended		6 Months Ended
Income Taxes Narratives (Details) (USD $)	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011	Jan. 31, 2012
Income Taxes [Line Items]
Income tax provision	$ 9,183,000	$ 49,638,000	$ 29,348,000	$ 56,902,000
Effective tax rate (percent)			(278.70%)	(158.80%)
Deferred tax liability for investment in Verint	33,100,000		33,100,000
Unrecognized tax benefits, if recognized would impact effective tax rate	124,200,000		124,200,000
Amount unrecognized tax benefits could decrease in the next twelve months as a result of settlement of certain tax audits or lapses of statutes of limitation	6,700,000		6,700,000
Accrued interest and penalties	52,800,000		52,800,000		54,600,000
Starhome
Income Taxes [Line Items]
Additional deferred tax asset and related valuation allowance	$ 12,400,000