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Fair Value Measurements (Tables) | 9 Months Ended
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Feb. 29, 2016
Fair Value Disclosures [Abstract] |
Financial assets and liabilities measured at fair value on a recurring basis | The Company’s financial assets and liabilities measured at fair value on a recurring basis were as follows:
| February 29, 2016
In millions | Carrying value (Fair value) |  | Quoted prices in active markets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Commercial paper | $ | 965.8 |  |  | $ | — |  |  | $ | 965.8 |  |  | $ | — |
Time deposits | 150.0 |  |  | 150.0 |  |  | — |  |  | — |
U.S. government agency securities | 200.0 |  |  | — |  |  | 200.0 |  |  | — |
Money market securities | 0.1 |  |  | 0.1 |  |  | — |  |  | — |
Total cash equivalents | $ | 1,315.9 |  |  | $ | 150.1 |  |  | $ | 1,165.8 |  |  | $ | — |
Available-for-sale securities: |  |  |  |  |  |  |
Corporate bonds | $ | 110.4 |  |  | $ | — |  |  | $ | 110.4 |  |  | $ | — |
General obligation municipal bonds | 1,662.6 |  |  | — |  |  | 1,662.6 |  |  | — |
Pre-refunded municipal bonds | 69.7 |  |  | — |  |  | 69.7 |  |  | — |
Revenue municipal bonds | 951.3 |  |  | — |  |  | 951.3 |  |  | — |
U.S. government agency securities | 121.2 |  |  | — |  |  | 121.2 |  |  | — |
Variable rate demand notes | 68.0 |  |  | — |  |  | 68.0 |  |  | — |
Total available-for-sale securities | $ | 2,983.2 |  |  | $ | — |  |  | $ | 2,983.2 |  |  | $ | — |
Other | $ | 13.8 |  |  | $ | 13.8 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Other long-term liabilities | $ | 13.8 |  |  | $ | 13.8 |  |  | $ | — |  |  | $ | — |
| May 31, 2015
In millions | Carrying value (Fair value) |  | Quoted prices in active markets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Commercial paper | $ | 15.0 |  |  | $ | — |  |  | $ | 15.0 |  |  | $ | — |
General obligation municipal bonds | 55.1 |  |  | — |  |  | 55.1 |  |  | — |
Pre-refunded municipal bonds | 20.5 |  |  | — |  |  | 20.5 |  |  | — |
Revenue municipal bonds | 12.3 |  |  | — |  |  | 12.3 |  |  | — |
Money market securities | 0.2 |  |  | 0.2 |  |  | — |  |  | — |
Total cash equivalents | $ | 103.1 |  |  | $ | 0.2 |  |  | $ | 102.9 |  |  | $ | — |
Available-for-sale securities: |  |  |  |  |  |  |
General obligation municipal bonds | $ | 1,703.7 |  |  | $ | — |  |  | $ | 1,703.7 |  |  | $ | — |
Pre-refunded municipal bonds | 102.7 |  |  | — |  |  | 102.7 |  |  | — |
Revenue municipal bonds | 963.6 |  |  | — |  |  | 963.6 |  |  | — |
Variable rate demand notes | 825.6 |  |  | — |  |  | 825.6 |  |  | — |
Total available-for-sale securities | $ | 3,595.6 |  |  | $ | — |  |  | $ | 3,595.6 |  |  | $ | — |
Other | $ | 14.2 |  |  | $ | 14.2 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Other long-term liabilities | $ | 14.2 |  |  | $ | 14.2 |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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