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Cash and Marketable Securities - Summary of components of marketable securities (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Feb. 28, 2022	May 31, 2021
Marketable Securities [Line Items]
Amortized Cost	$ 337,409	$ 305,279
Unrealized gains	7	239
Unrealized Losses	(1,856)	(33)
Fair Value	335,560	305,485
Commercial Paper And Corporate Bonds [Member]
Marketable Securities [Line Items]
Amortized Cost	337,159	299,524
Unrealized gains	7	209
Unrealized Losses	(1,856)	(33)
Fair Value	335,310	299,700
Certificates of Deposit [Member]
Marketable Securities [Line Items]
Amortized Cost	250	5,755
Unrealized gains		30
Unrealized Losses
Fair Value	$ 250	$ 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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