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Cash and Marketable Securities - Components of marketable securities (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Nov. 30, 2021	May 31, 2021
Marketable Securities [Line Items]
Amortized Cost	$ 338,688	$ 305,279
Unrealized gains	20	239
Unrealized Losses	(578)	(33)
Fair Value	338,130	305,485
Commercial Paper And Corporate Bonds [Member]
Marketable Securities [Line Items]
Amortized Cost	337,437	299,524
Unrealized gains	18	209
Unrealized Losses	(578)	(33)
Fair Value	336,877	299,700
Certificates of Deposit [Member]
Marketable Securities [Line Items]
Amortized Cost	1,251	5,755
Unrealized gains	2	30
Unrealized Losses
Fair Value	$ 1,253	$ 5,785

X

- Definition

Amount of unrealized gain on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

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- Definition

Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

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+ References

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562

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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562

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Amortized cost of investments in debt securities classified as trading.

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