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Marketable Securities (Detail) - USD ($) $ in Thousands | Feb. 28, 2021 | May 31, 2020
--- | --- | ---
Marketable Securities, Current | $ 279,865 | $ 277,404
US Treasury Securities | Maturing in 0 - 90 days |  |
Marketable Securities, Current | 0 | 0
US Treasury Securities | Maturing in 91 - 180 days |  |
Marketable Securities, Current | 0 | 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 | 0
Commercial Paper | Maturing in 0 - 90 days |  |
Marketable Securities, Current | 158,183 | 133,130
Commercial Paper | Maturing in 91 - 180 days |  |
Marketable Securities, Current | 81,850 | 73,824
Commercial Paper | Maturing in 181 days - 1 year |  |
Marketable Securities, Current | 30,189 | 43,231
Commercial Paper | Maturing in 1 - 2 years |  |
Marketable Securities, Current | 1,310 | 7,839
Certificates of Deposit | Maturing in 0 - 90 days |  |
Marketable Securities, Current | 1,253 | 1,003
Certificates of Deposit | Maturing in 91 - 180 days |  |
Marketable Securities, Current | 3,550 | 5,184
Certificates of Deposit | Maturing in 181 days - 1 year |  |
Marketable Securities, Current | 3,277 | 6,069
Certificates of Deposit | Maturing in 1 - 2 years |  |
Marketable Securities, Current | $ 253 | $ 4,592

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