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Investment Expense (Income), Net - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018
Investments Debt And Equity Securities [Abstract] |  |
Unrealized gains on trading securities | $ 0.6 |
Unrealized gains on marketable equity securities | $ 2.9 |
Gross gains realized on sales of marketable securities |  | $ 0.6
Gross losses realized on sales of marketable securities |  | 0.1
Other than temporary impairment marketable securities |  | $ 0.1

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- Definition Gross realized gains on sales of marketable securities. + References No definition available. + Details
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- Definition Gross realized losses on sales of marketable securities. + References No definition available. + 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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- Definition Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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