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Investment Expense (Income), Net - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018
Investments Debt And Equity Securities [Abstract] |  |  |  |
Gross realized gains on sales of available-for-sale securities | $ 0.1 |  | $ 0.3 |
Gross realized losses on sales of available-for-sale securities | 2.2 |  | 3.4 |
Realized gains on trading securities | 0.2 |  | 0.2 |
Unrealized losses on trading securities | 0.1 |  | 0.7 |
Unrealized gains (losses) on marketable equity securities | $ 3.7 |  | $ (2.9) |
Gross gains realized on sales of marketable securities |  | $ 2.6 |  | $ 8.6
Gross losses realized on sales of marketable securities |  | $ 0.7 |  | $ 1.8

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- Definition Amount of realized 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=82897076&loc=d3e27357-111563 + Details
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- Definition Amount of realized gain from sale of 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=84241550&loc=SL75117546-209714 + Details
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