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Marketable Securities (Detail) - USD ($) | May 31, 2020 | May 31, 2019
--- | --- | ---
Marketable Securities, Current | $ 277,404,000 | $ 225,836,000
US Treasury Securities | Maturing in 0 - 90 days |  |
Marketable Securities, Current |  | 2,470,000
US Treasury Securities | Maturing in 181 days - 1 year |  |
Marketable Securities, Current | 2,532,000 | 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 | 133,130,000 | 84,338,000
Commercial Paper | Maturing in 91 - 180 days |  |
Marketable Securities, Current | 73,824,000 | 47,960,000
Commercial Paper | Maturing in 181 days - 1 year |  |
Marketable Securities, Current | 43,231,000 | 34,369,000
Commercial Paper | Maturing in 1 - 2 years |  |
Marketable Securities, Current | 7,839,000 | 34,078,000
Certificates of Deposit | Maturing in 0 - 90 days |  |
Marketable Securities, Current | 1,003,000 | 7,732,000
Certificates of Deposit | Maturing in 91 - 180 days |  |
Marketable Securities, Current | 5,184,000 | 5,000,000
Certificates of Deposit | Maturing in 181 days - 1 year |  |
Marketable Securities, Current | 6,069,000 | 750,000
Certificates of Deposit | Maturing in 1 - 2 years |  |
Marketable Securities, Current | $ 4,592,000 | $ 4,199,000

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