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v3.7.0.1

Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | May 31, 2017 | May 31, 2016
--- | --- | ---
Income Taxes [Abstract] |  |
Compensation and employee benefit liabilities | $ 23.1 | $ 21.4
Other current liabilities | 9.1 | 7.9
Tax credit carry forward | 39.3 | 40.0
Depreciation | 7.3 | 8.8
Stock-based compensation | 21.8 | 22.0
Tax benefit of uncertain tax positions | 6.4 | 18.6
Other | 7.6 | 7.1
Gross deferred tax assets | 114.6 | 125.8
Capitalized software | 54.8 | 56.3
Depreciation | 1.6 | 2.5
Goodwill and Intangible assets | 66.8 | 58.5
Revenue not subject to current taxes | 13.6 | 13.3
Unrealized gains on available-for-sale securities | 11.7 | 17.3
Gross deferred tax liabilities | 148.5 | 147.9
Net deferred tax liability | $ (33.9) | $ (22.1)

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