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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

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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