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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Nov. 30, 2013 | May 31, 2013
--- | --- | ---
Available-for-sale securities: |  |
Available-for-sale securities | $ 2,830.5 | $ 3,691.4
Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 2,830.5 | 3,691.4
Other securities | 12.7 | 10.7
Liabilities: |  |
Other long-term liabilities | 12.7 | 10.7
General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 1,655.7 | 1,456.8
Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 130.0 | 203.9
Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 846.4 | 754.0
Variable rate demand notes [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 198.4 | 1,276.7
Quoted prices in active markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Other securities | 12.7 | 10.7
Liabilities: |  |
Other long-term liabilities | 12.7 | 10.7
Quoted prices in active markets (Level 1) [Member] | General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Quoted prices in active markets (Level 1) [Member] | Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Quoted prices in active markets (Level 1) [Member] | Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Quoted prices in active markets (Level 1) [Member] | Variable rate demand notes [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Significant other observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 2,830.5 | 3,691.4
Other securities | 0 | 0
Liabilities: |  |
Other long-term liabilities | 0 | 0
Significant other observable Inputs (Level 2) [Member] | General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 1,655.7 | 1,456.8
Significant other observable Inputs (Level 2) [Member] | Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 130.0 | 203.9
Significant other observable Inputs (Level 2) [Member] | Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 846.4 | 754.0
Significant other observable Inputs (Level 2) [Member] | Variable rate demand notes [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 198.4 | 1,276.7
Significant unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Other securities | 0 | 0
Liabilities: |  |
Other long-term liabilities | 0 | 0
Significant unobservable Inputs (Level 3) [Member] | General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Significant unobservable Inputs (Level 3) [Member] | Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Significant unobservable Inputs (Level 3) [Member] | Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | 0 | 0
Significant unobservable Inputs (Level 3) [Member] | Variable rate demand notes [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities | $ 0 | $ 0

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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