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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

X

- Definition

Amount of investment in marketable security, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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