Income Tax (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 30, 2015	Apr. 30, 2014
Income Tax Disclosure [Abstract]
Effective tax rate	12.00%	21.00%
Decrease in effective tax rate	(9.00%)
Effective tax rate excluding the impact of discrete tax items	27.00%
Federal statutory rate	35.00%
Unrecognized tax benefits	$ 248.4us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate	230.0
Deferred tax assets, net	$ 188.0us-gaap_DeferredTaxAssetsLiabilitiesNet

Effective Income Tax Rate

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- Definition

Effective Tax Rate - Increase/Decrease in the effective tax rate

+ References

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, before jurisdictional netting.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Topic 235

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-Subparagraph (SX 210.4-08.(h)(2))

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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-Subparagraph (SAB TOPIC 6.I)

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Glossary Unrecognized Tax Benefit

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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