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Investment (Income) Expense, Net - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Investments Debt And Equity Securities [Abstract] |  |  |  |
Net gains (losses) on marketable securities | $ (6,918) | $ 1,683 | $ 3,562 | $ (6,451)
Unrealized losses on marketable equity securities | 6,600 |  |  | 2,900
Unrealized losses on trading securities | $ 1,500 | 100 |  | 700
Unrealized gains on marketable equity securities |  | 3,700 | 2,300 |
Unrealized gains on trading securities |  |  | $ 100 |
Gross gains realized on sales of marketable securities |  | 100 |  | 300
Gross realized losses on sales of marketable securities |  | 2,200 |  | 3,400
Realized gains on trading securities |  | $ 200 |  | $ 200

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