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Net Loss (Gain) on Marketable Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Aug. 31, 2022 | Aug. 31, 2021
Net Loss (Gain) on Marketable Securities |  |
Unrealized losses (gains) on marketable equity securities | $ 6,513 | $ (3,218)
Realized losses (gains) on marketable equity securities | 129 | (269)
Realized (gains) losses on available-for-sale debt securities | (36) | 11
Net loss (gain) on marketable securities | $ 6,606 | $ (3,476)

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References 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 + Details
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- Definition Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI). + References No definition available. + Details
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- Definition Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI). + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) on investment in marketable security. + References 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 + Details
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