Income Taxes Income Tax (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 30, 2013	Apr. 30, 2012
Income Tax Disclosure [Abstract]
Effective Income Tax Rate, Continuing Operations	23.00%	19.00%
Effective Tax Rate - Increase/Decrease in the effective tax rate	4.00%
Effective tax rate excluding the impact of discrete tax items	24.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
Unrecognized Tax Benefits (in usd)	$ 214.7
Unrecognized Tax Benefits that Would Impact Effective Tax Rate (in usd)	205.4
Deferred Tax Assets, Net (in usd)	$ 190.3

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

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.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

+ References

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

-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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