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Marketable Securities (Detail) - USD ($) $ in Thousands	Aug. 31, 2020	May 31, 2020
Marketable Securities, Current	$ 306,539	$ 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	2,516	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	120,055	133,130
Commercial Paper | Maturing in 91 - 180 days
Marketable Securities, Current	93,239	73,824
Commercial Paper | Maturing in 181 days - 1 year
Marketable Securities, Current	63,668	43,231
Commercial Paper | Maturing in 1 - 2 years
Marketable Securities, Current	10,012	7,839
Certificates of Deposit | Maturing in 0 - 90 days
Marketable Securities, Current	4,908	1,003
Certificates of Deposit | Maturing in 91 - 180 days
Marketable Securities, Current	1,257	5,184
Certificates of Deposit | Maturing in 181 days - 1 year
Marketable Securities, Current	8,338	6,069
Certificates of Deposit | Maturing in 1 - 2 years
Marketable Securities, Current	$ 2,546	$ 4,592

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- 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=118951113&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=6877327&loc=d3e13212-122682

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