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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | May 31, 2014 | May 31, 2013
--- | --- | ---
Deferred tax assets: |  |
Compensation and employee benefit liabilities | $ 18.7 | $ 16.3
Other current liabilities | 6.9 | 6.3
Tax credit carry forward | 38.3 | 35.3
Depreciation | 8.3 | 8.5
Stock-based compensation | 21.1 | 24.6
Other | 15.4 | 16.6
Gross deferred tax assets | 108.7 | 107.6
Deferred tax liabilities: |  |
Capitalized software | 50.1 | 45.8
Depreciation | 12.2 | 20.2
Goodwill and Intangible assets | 46.7 | 41.0
Revenue not subject to current taxes | 12.6 | 11.7
Unrealized gains on available-for-sale securities | 13.2 | 13.3
Other | 0.4 | 0.6
Gross deferred tax liabilities | 135.2 | 132.6
Net deferred tax liability | $ (26.5) | $ (25.0)

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