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Marketable Securities (Detail) - USD ($) $ in Thousands | May 31, 2021 | May 31, 2020
--- | --- | ---
Marketable Securities, Current | $ 305,485 | $ 277,404
US Treasury Securities | Maturing in 0 - 90 days |  |
Marketable Securities, Current | 0 |
US Treasury Securities | Maturing in 91 - 180 days |  |
Marketable Securities, Current | 0 |
US Treasury Securities | Maturing in 181 days - 1 year |  |
Marketable Securities, Current | 0 | 2,532
US Treasury Securities | Maturing in 1 - 2 years |  |
Marketable Securities, Current | 0 |
Commercial Paper | Maturing in 0 - 90 days |  |
Marketable Securities, Current | 106,631 | 133,130
Commercial Paper | Maturing in 91 - 180 days |  |
Marketable Securities, Current | 78,727 | 73,824
Commercial Paper | Maturing in 181 days - 1 year |  |
Marketable Securities, Current | 87,590 | 43,231
Commercial Paper | Maturing in 1 - 2 years |  |
Marketable Securities, Current | 26,752 | 7,839
Certificates of Deposit | Maturing in 0 - 90 days |  |
Marketable Securities, Current | 3,262 | 1,003
Certificates of Deposit | Maturing in 91 - 180 days |  |
Marketable Securities, Current | 1,260 | 5,184
Certificates of Deposit | Maturing in 181 days - 1 year |  |
Marketable Securities, Current | 1,263 | 6,069
Certificates of Deposit | Maturing in 1 - 2 years |  |
Marketable Securities, Current | $ 0 | $ 4,592

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