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Net Loss (Gain) on Marketable Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Feb. 28, 2022 | Feb. 28, 2021 | Feb. 28, 2022 | Feb. 28, 2021
Net Loss (Gain) on Marketable Securities |  |  |  |
Unrealized losses (gains) on marketable equity securities | $ 8,903 | $ (6,650) | $ 11,227 | $ (28,469)
Realized (gains) on marketable equity securities | (699) | (2,834) | (1,223) | (1,210)
Realized losses on available-for-sale debt securities | 11 | 4 | 28 | 27
Net loss (gain) on marketable securities | $ 8,215 | $ (9,480) | $ 10,032 | $ (29,652)

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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 http://asc.fasb.org/extlink&oid=123367319&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 http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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