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Fair Value Measurements (Tables) | 3 Months Ended
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Aug. 31, 2022
Fair Value Disclosures [Abstract] |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The Company’s financial assets and liabilities measured at fair value on a recurring basis were as follows:
|  | August 31, 2022 |
|  |  |  |  |  | Quoted |  |  | Significant |  |  |  |  |
|  |  |  |  |  | prices in |  |  | other |  |  | Significant |
|  | Carrying |  |  | active |  |  | observable |  |  | unobservable |
|  | value |  |  | markets |  |  | inputs |  |  | inputs |
In millions |  | (Fair value) |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted and unrestricted cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ |  | 49.8 |  |  | $ |  | — |  |  | $ |  | 49.8 |  |  | $ |  | — |
Money market securities |  |  |  | 46.1 |  |  |  |  | 46.1 |  |  |  |  | — |  |  |  |  | — |
Total restricted and unrestricted cash equivalents |  | $ |  | 95.9 |  |  | $ |  | 46.1 |  |  | $ |  | 49.8 |  |  | $ |  | — |
AFS securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  | $ |  | 54.5 |  |  | $ |  | — |  |  | $ |  | 54.5 |  |  | $ |  | — |
Corporate bonds |  |  |  | 686.9 |  |  |  |  | — |  |  |  |  | 686.9 |  |  |  |  | — |
Municipal bonds |  |  |  | 1,406.8 |  |  |  |  | — |  |  |  |  | 1,406.8 |  |  |  |  | — |
U.S. government agency and treasury securities |  |  |  | 564.9 |  |  |  |  | — |  |  |  |  | 564.9 |  |  |  |  | — |
Variable rate demand notes |  |  |  | 11.7 |  |  |  |  | — |  |  |  |  | 11.7 |  |  |  |  | — |
Total AFS securities |  | $ |  | 2,724.8 |  |  | $ |  | — |  |  | $ |  | 2,724.8 |  |  | $ |  | — |
Other |  | $ |  | 31.5 |  |  | $ |  | 31.5 |  |  | $ |  | — |  |  | $ |  | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  | $ |  | 31.5 |  |  | $ |  | 31.5 |  |  | $ |  | — |  |  | $ |  | — |
|  | May 31, 2022 |
|  |  |  |  |  | Quoted |  |  | Significant |  |  |  |  |
|  |  |  |  |  | prices in |  |  | other |  |  | Significant |
|  | Carrying |  |  | active |  |  | observable |  |  | unobservable |
|  | value |  |  | markets |  |  | inputs |  |  | inputs |
In millions |  | (Fair value) |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted and unrestricted cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ |  | 5.2 |  |  | $ |  | — |  |  | $ |  | 5.2 |  |  | $ |  | — |
Time deposits |  |  |  | 187.9 |  |  |  |  | — |  |  |  |  | 187.9 |  |  |  |  | — |
VRDNs |  |  |  | 10.0 |  |  |  |  | — |  |  |  |  | 10.0 |  |  |  |  | — |
Money market securities |  | $ |  | 16.1 |  |  | $ |  | 16.1 |  |  | $ |  | — |  |  | $ |  | — |
Total restricted and unrestricted cash equivalents |  | $ |  | 219.2 |  |  | $ |  | 16.1 |  |  | $ |  | 203.1 |  |  | $ |  | — |
AFS securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  | $ |  | 67.2 |  |  | $ |  | — |  |  | $ |  | 67.2 |  |  | $ |  | — |
Corporate bonds |  |  |  | 682.1 |  |  |  |  | — |  |  |  |  | 682.1 |  |  |  |  | — |
Municipal bonds |  |  |  | 1,485.8 |  |  |  |  | — |  |  |  |  | 1,485.8 |  |  |  |  | — |
U.S. government agency and treasury securities |  |  |  | 548.5 |  |  |  |  | — |  |  |  |  | 548.5 |  |  |  |  | — |
VRDNs |  |  |  | 1,245.6 |  |  |  |  | — |  |  |  |  | 1,245.6 |  |  |  |  | — |
Total AFS securities |  | $ |  | 4,029.2 |  |  | $ |  | — |  |  | $ |  | 4,029.2 |  |  | $ |  | — |
Other |  | $ |  | 30.0 |  |  | $ |  | 30.0 |  |  | $ |  | — |  |  | $ |  | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  | $ |  | 29.9 |  |  | $ |  | 29.9 |  |  | $ |  | — |  |  | $ |  | — |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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