Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
$ in Millions
May. 31, 2015
May. 31, 2014
Deferred tax assets:    
Compensation and employee benefit liabilities $ 20.9 $ 18.7
Other current liabilities 6.9 6.9
Tax credit carry forward 40.1 38.3
Depreciation 11.9 8.3
Stock-based compensation 21.6 21.1
Other 24.9 28.7
Gross deferred tax assets 126.3 122.0
Deferred tax liabilities:    
Capitalized software 53.6 50.1
Depreciation 3.8 12.2
Goodwill and Intangible assets 52.0 46.7
Revenue not subject to current taxes 13.1 12.6
Unrealized gains on available-for-sale securities 5.3 13.2
Other 0.3 0.4
Gross deferred tax liabilities 128.1 135.2
Net deferred tax liability $ (1.8) $ (13.2)