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Investment (Income) Expense, Net - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2019 | Nov. 30, 2018
Investments Debt And Equity Securities [Abstract] |  |  |  |
Net (gain) loss on marketable securities | $ (6,939) | $ 8,520 | $ (10,479) | $ 8,134
Unrealized gains on marketable equity securities | 6,000 |  | 8,900 |
Unrealized gains on trading securities | $ 1,000 |  | $ 1,700 | 500
Gross realized losses on sales of marketable securities |  | 1,000 |  | 1,200
Unrealized losses on trading securities |  | 1,000 |  | 1,100
Gross gains realized on sales of marketable securities |  |  |  | 200
Unrealized losses on marketable equity securities |  | $ 6,500 |  | $ 6,500

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- Definition Amount of unrealized and realized gain (loss) on investment in debt and equity securities. + 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(9)(a)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 2: 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=116634182&loc=SL114868664-224227 + Details
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- 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=118939692&loc=d3e27357-111563 + Details
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