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Fair Value Measurements (Details) (USD $) In Millions | May 31, 2011 | May 31, 2010
--- | --- | ---
Available-for-sale securities: |  |
Available-for-sale securities | $ 2,737.2 | $ 2,151.8
Other securities | 8.9 | 7.3
Liabilities |  |
Other long-term liabilities | 8.9 | 7.3
Quoted prices in active markets (Level 1) [Member] |  |
Available-for-sale securities: |  |
Other securities | 8.9 | 7.3
Quoted prices in active markets (Level 1) [Member] |  |
Liabilities |  |
Other long-term liabilities | 8.9 | 7.3
General obligation municipal bonds [Member] | Significant other observable Inputs (Level 2) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 1,050.5 | 984.5
Pre-refunded municipal bonds [Member] | Significant other observable Inputs (Level 2) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 484.7 | 559.3
Revenue municipal bonds [Member] | Significant other observable Inputs (Level 2) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 373.7 | 381.7
Variable rate demand notes [Member] | Significant other observable Inputs (Level 2) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 828.3 | 226.3
Significant other observable Inputs (Level 2) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 2,737.2 | 2,151.8
General obligation municipal bonds [Member] | Significant unobservable Inputs (Level 3) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Pre-refunded municipal bonds [Member] | Significant unobservable Inputs (Level 3) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Revenue municipal bonds [Member] | Significant unobservable Inputs (Level 3) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Variable rate demand notes [Member] | Significant unobservable Inputs (Level 3) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Significant unobservable Inputs (Level 3) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Other securities | 0 | 0
Significant unobservable Inputs (Level 3) [Member] |  |
Liabilities |  |
Other long-term liabilities | 0 | 0
General obligation municipal bonds [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 1,050.5 | 984.5
Pre-refunded municipal bonds [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 484.7 | 559.3
Revenue municipal bonds [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 373.7 | 381.7
Variable rate demand notes [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | $ 828.3 | $ 226.3

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- Definition This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a + Details
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