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Cash and Marketable Securities (Tables) | 9 Months Ended
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Feb. 28, 2021
Cash and Cash Equivalents [Abstract] |
Schedule Of Classification And Maturities Of Marketable Securities | Marketable Securities as of February 28, 2021 and May 31, 2020 are listed below by classification and remaining maturities.
(in thousands) |  | Maturity |  | February 28, 2021 |  |  | May 31, 2020 |
US Treasuries |  | 0 - 90 days |  | $ | — |  |  | $ | — |
|  | 91 - 180 days |  |  | — |  |  |  | — |
|  | 181 days - 1 year |  |  | — |  |  |  | 2,532 |
|  | 1 - 2 years |  |  | — |  |  |  | — |
Commercial Paper & Corporate Bonds |  | 0 - 90 days |  |  | 158,183 |  |  |  | 133,130 |
|  | 91 - 180 days |  |  | 81,850 |  |  |  | 73,824 |
|  | 181 days - 1 year |  |  | 30,189 |  |  |  | 43,231 |
|  | 1 - 2 years |  |  | 1,310 |  |  |  | 7,839 |
Certificates of Deposit |  | 0 - 90 days |  |  | 1,253 |  |  |  | 1,003 |
|  | 91 - 180 days |  |  | 3,550 |  |  |  | 5,184 |
|  | 181 days -1 year |  |  | 3,277 |  |  |  | 6,069 |
|  | 1 - 2 years |  |  | 253 |  |  |  | 4,592 |
Total Marketable Securities |  |  |  | $ | 279,865 |  |  | $ | 277,404 |
Summary of components of marketable securities | The components of marketable securities at February 28, 2021 are as follows:
(in thousands) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
US Treasuries |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Commercial Paper & Corporate Bonds |  |  | 271,600 |  |  |  | 185 |  |  |  | (253 | ) |  |  | 271,532 |
Certificates of Deposit |  |  | 8,284 |  |  |  | 49 |  |  |  | — |  |  |  | 8,333 |
Total Marketable Securities |  | $ | 279,884 |  |  | $ | 234 |  |  | $ | (253 | ) |  | $ | 279,865 |
The components of marketable securities at May 31, 2020 are as follows:
(in thousands) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
US Treasuries |  | $ | 2,502 |  |  | $ | 30 |  |  | $ | — |  |  | $ | 2,532 |
Commercial Paper & Corporate Bonds |  |  | 257,700 |  |  |  | 347 |  |  |  | (23 | ) |  |  | 258,024 |
Certificates of Deposit |  |  | 16,648 |  |  |  | 200 |  |  |  | — |  |  |  | 16,848 |
Total Marketable Securities |  | $ | 276,850 |  |  | $ | 577 |  |  | $ | (23 | ) |  | $ | 277,404 |

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