Income Tax Income Tax (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 30, 2014	Apr. 30, 2013
Income Tax Disclosure [Abstract]
Effective tax rate	21.00%	23.00%
Decrease in effective tax rate	2.00%
Effective tax rate excluding the impact of discrete tax items	25.00%
Federal statutory rate	35.00%
Unrecognized tax benefits	$ 226.2
Unrecognized tax benefits that would impact effective tax rate	218.6
Deferred tax assets, net	148.1
Reduction to deferred tax assets	$ 35.5

Effective Income Tax Rate

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- Definition

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

+ References

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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

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-Topic 235

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-Section S99

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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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-Topic 740

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-Section S99

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-Subparagraph (SAB TOPIC 6.I)

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- Definition

The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.

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-Topic 230

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-Section 45

-Paragraph 28

-Subparagraph (a)

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

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-Publisher FASB

-Name Accounting Standards Codification

-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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