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Marketable Securities (Detail) - USD ($) | May 31, 2019 | May 31, 2018
--- | --- | ---
Marketable Securities, Current | $ 225,836,000 | $ 127,736,000
US Treasury Securities | Maturing in 0 - 90 days |  |
Marketable Securities, Current | 2,470,000 | 19,910,000
US Treasury Securities | Maturing in 181 days - 1 year |  |
Marketable Securities, Current | 2,435,000 |
US Treasury Securities | Maturing in 1 - 2 years |  |
Marketable Securities, Current | 2,505,000 |
Commercial Paper | Maturing in 0 - 90 days |  |
Marketable Securities, Current | 84,338,000 | 47,740,000
Commercial Paper | Maturing in 91 - 180 days |  |
Marketable Securities, Current | 47,960,000 | 32,673,000
Commercial Paper | Maturing in 181 days - 1 year |  |
Marketable Securities, Current | 34,369,000 |
Commercial Paper | Maturing in 1 - 2 years |  |
Marketable Securities, Current | 34,078,000 |
Certificates of Deposit | Maturing in 0 - 90 days |  |
Marketable Securities, Current | 7,732,000 | 5,446,000
Certificates of Deposit | Maturing in 91 - 180 days |  |
Marketable Securities, Current | 5,000,000 | 8,747,000
Certificates of Deposit | Maturing in 181 days - 1 year |  |
Marketable Securities, Current | 750,000 | $ 13,220,000
Certificates of Deposit | Maturing in 1 - 2 years |  |
Marketable Securities, Current | $ 4,199,000 |

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