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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | May 31, 2013 | May 31, 2012
--- | --- | ---
Available-for-sale securities: |  |  |  |
Available-for-sale securities | $ 3,691.4 |  | $ 3,059.0 |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 3,691.4 |  | 3,059.0 |
Other securities | 10.7 |  | 9.2 |
Liabilities: |  |  |  |
Other long-term liabilities | 10.7 |  | 9.2 |
Variable Rate Demand Obligation [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 1,276.7 |  | 889.8 |
Variable Rate Demand Obligation [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 1,276.7 |  | 889.8 |
Revenue municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 754.0 |  | 501.0 |
Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 754.0 |  | 501.0 |
Pre-refunded municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 203.9 | [1] | 334.3 | [1]
Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 203.9 |  | 334.3 |
General obligation municipal bonds [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 1,456.8 |  | 1,333.9 |
General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 1,456.8 |  | 1,333.9 |
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 | 10.7 |  | 9.2 |
Liabilities: |  |  |  |
Other long-term liabilities | 10.7 |  | 9.2 |
Quoted prices in active markets (Level 1) [Member] | Variable Rate Demand Obligation [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] | 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] | General obligation municipal bonds [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 | 3,691.4 |  | 3,059.0 |
Other securities | 0 |  | 0 |
Liabilities: |  |  |  |
Other long-term liabilities | 0 |  | 0 |
Significant other observable Inputs (Level 2) [Member] | Variable Rate Demand Obligation [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 1,276.7 |  | 889.8 |
Significant other observable Inputs (Level 2) [Member] | Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | 754.0 |  | 501.0 |
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 | 203.9 |  | 334.3 |
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 | 1,456.8 |  | 1,333.9 |
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] | Variable Rate Demand Obligation [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] | 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] | General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale securities: |  |  |  |
Available-for-sale securities | $ 0 |  | $ 0 |
[1] | (1) Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + 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=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of assets categorized as other which are not in and of themselves material enough to require separate disclosure. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of liabilities categorized as other which are not in and of themselves material enough to require separate disclosure. + References No definition available. + Details
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