Income Tax (Details) - Jul. 31, 2015 - USD ($) $ in Millions	Total	Total
Income Tax Disclosure [Abstract]
Effective tax rate excluding the impact of discrete tax items	25.00%	24.00%
Federal statutory rate	35.00%	35.00%
Deferred tax assets valuation allowance	$ 213.6	$ 213.6
Discrete income tax expense		205.3
Unrecognized tax benefits	251.1	251.1
Unrecognized tax benefits that would impact effective tax rate	$ 232.7	$ 232.7

Discrete Income Tax Expense (Benefit)

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- Definition

Effective Income Tax Rate

+ References

No definition available.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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

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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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