Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
May 31, 2013
May 31, 2012
Deferred tax assets:    
Compensation and employee benefit liabilities $ 16.3 $ 15.8
Other current liabilities 6.3 6.7
Tax credit carry forward 35.3 31.7
Depreciation 8.5 8.0
Stock-based compensation 24.6 28.5
Other 16.6 17.4
Gross deferred tax assets 107.6 108.1
Deferred tax liabilities:    
Capitalized software 45.8 39.3
Depreciation 20.2 21.8
Intangible assets 41.0 36.8
Revenue not subject to current taxes 11.7 11.1
Unrealized gains on available-for-sale securities 13.3 21.8
Other 0.6 1.0
Gross deferred tax liabilities 132.6 131.8
Net deferred tax liability $ (25.0) $ (23.7)