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Income Taxes (Tables) | 12 Months Ended
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May 31, 2011
Income Taxes (Tables) [Abstract] |
Components of deferred tax assets and liabilities |
|  | May 31, |
In millions |  | 2011 |  |  | 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 |
Components of the provision for income taxes |
|  | Year ended May 31, |
In millions |  | 2011 |  |  | 2010 |  |  | 2009 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 234.0 |  |  | $ | 230.2 |  |  | $ | 256.1 |
State |  |  | 29.3 |  |  |  | 26.0 |  |  |  | 24.4 |
Total current |  |  | 263.3 |  |  |  | 256.2 |  |  |  | 280.5 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 12.0 |  |  |  | (3.9 | ) |  |  | (1.3 | )
State |  |  | 1.6 |  |  |  | — |  |  |  | (0.6 | )
Total deferred |  |  | 13.6 |  |  |  | (3.9 | ) |  |  | (1.9 | )
Provision for income taxes |  | $ | 276.9 |  |  | $ | 252.3 |  |  | $ | 278.6 |
Reconciliation of the U.S. federal statutory tax rate |
|  | Year ended May 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Federal statutory tax rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
Increase/(decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of federal tax benefit |  |  | 2.5 |  |  |  | 2.3 |  |  |  | 1.9 |
Tax-exempt municipal bond interest |  |  | (2.2 | ) |  |  | (2.7 | ) |  |  | (2.6 | )
Other items |  |  | (0.3 | ) |  |  | — |  |  |  | — |
Effective income tax rate |  |  | 35.0 | % |  |  | 34.6 | % |  |  | 34.3 | %
Reconciliation of gross unrecognized tax benefits, not including interest or potential offsetting effects |
|  | Year ended May 31, |
In millions |  | 2011 |  |  | 2010 |  |  | 2009 |
Balance as of beginning of fiscal year |  | $ | 35.8 |  |  | $ | 35.8 |  |  | $ | 25.7 |
Additions for tax positions of the current year |  |  | 6.0 |  |  |  | 0.5 |  |  |  | 10.7 |
Additions for tax positions of prior years |  |  | 0.1 |  |  |  | — |  |  |  | (0.2 | )
Reductions for tax positions of prior years |  |  | (0.1 | ) |  |  | — |  |  |  | — |
Settlements with tax authorities |  |  | — |  |  |  | — |  |  |  | (0.1 | )
Expiration of the statute of limitations |  |  | (0.6 | ) |  |  | (0.5 | ) |  |  | (0.3 | )
Balance as of end of fiscal year |  | $ | 41.2 |  |  | $ | 35.8 |  |  | $ | 35.8 |

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