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v3.5.0.2

Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | May 31, 2016 | May 31, 2015
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Income Taxes [Abstract] |  |
Compensation and employee benefit liabilities | $ 21.4 | $ 20.9
Other current liabilities | 7.9 | 6.9
Tax credit carry forward | 40.0 | 40.1
Depreciation | 8.8 | 11.9
Stock-based compensation | 22.0 | 21.6
Tax benefit of uncertain tax positions | 18.6 | 15.7
Other | 7.1 | 9.2
Gross deferred tax assets | 125.8 | 126.3
Capitalized software | 56.3 | 53.6
Depreciation | 2.5 | 3.8
Goodwill and intangible assets | 58.5 | 52.0
Revenue not subject to current taxes | 13.3 | 13.1
Unrealized gains on available-for-sale securities | 17.3 | 5.3
Other |  | 0.3
Gross deferred tax liabilities | 147.9 | 128.1
Net deferred tax liability | $ (22.1) | $ (1.8)

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