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Investment Expense (Income), Net (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017
Other Income And Expenses [Abstract] |  |  |  |
Interest (income) | $ (828) | $ (1,297) | $ (1,732) | $ (2,191)
Net loss (gain) on marketable securities | 8,520 | (2,037) | 8,134 | (4,897)
Dividend (income) | (659) | (405) | (1,802) | (1,104)
Investment expense (income), net | $ 7,033 | $ (3,739) | $ 4,600 | $ (8,192)

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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=115205541&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=115205541&loc=SL114868664-224227 + Details
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