Investment (Income) Expense, Net - Net (Gain) Loss on Marketable Securities (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Net (Gain) Loss on Marketable Securities
Unrealized losses on marketable equity securities	$ 946	$ 8,903	$ 3,704	$ 11,227
Realized (gains) on marketable equity securities	(525)	(699)	(435)	(1,223)
Realized losses (gains) on available-for-sale debt securities	8	11	(28)	28
Net loss on marketable securities	$ 429	$ 8,215	$ 3,241	$ 10,032

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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Amount of unrealized gain (loss) on investment in marketable security.

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