Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Millions
May 31, 2011
May 31, 2010
Deferred tax assets:    
Compensation and employee benefit liabilities $ 16.3 $ 14.7
Other current liabilities 9.4 8.3
Tax credit carry forward 27.4 22.5
Depreciation 6.7 12.0
Stock-based compensation 29.8 25.2
Other 18.2 7.6
Gross deferred tax assets 107.8 90.3
Deferred tax liabilities:    
Capitalized software 33.2 27.6
Depreciation 16.6 0.1
Intangible assets 32.5 27.7
Revenue not subject to current taxes 10.0 10.5
Unrealized gains on available-for-sale securities 21.7 24.1
Other 0.5 0.2
Gross deferred tax liabilities 114.5 90.2
Net deferred tax (liability)/asset $ (6.7) $ 0.1