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Summary of Available-for-Sale Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | Nov. 30, 2018 | May 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-Sale Debt Securities, Amortized Cost | $ 23,703 | $ 23,994
Available-for-Sale Debt Securities, Gross Unrealized Gains | 55 | 82
Available-for-Sale Debt Securities, Gross Unrealized Losses | (535) | (560)
Available-for-Sale Debt Securities, Fair Value (Net Carrying Amount) | 23,223 | 23,516
Equity Securities, Amortized Cost |  | 145,956
Equity Securities, Gross Unrealized Gains |  | 2,566
Equity Securities, Gross Unrealized Losses |  | (3,967)
Equity Securities, Fair Value (Net Carrying Amount) | 116,700 | 144,555
Total Securities, Amortized Cost |  | 169,950
Total Securities, Gross Unrealized Gains |  | (2,648)
Total Securities, Gross Unrealized Losses |  | (4,527)
Total Securities, Fair Value (Net Carrying Amount) |  | $ 168,071
Foreign |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities, FV-NI, Type [Extensible List] |  | us-gaap:MutualFundMember
Equity Securities, Amortized Cost |  | $ 46,123
Equity Securities, Gross Unrealized Gains |  | 1,839
Equity Securities, Gross Unrealized Losses |  | (1,197)
Equity Securities, Fair Value (Net Carrying Amount) |  | $ 46,765
Domestic |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities, FV-NI, Type [Extensible List] |  | us-gaap:MutualFundMember
Equity Securities, Amortized Cost |  | $ 99,833
Equity Securities, Gross Unrealized Gains |  | 727
Equity Securities, Gross Unrealized Losses |  | (2,770)
Equity Securities, Fair Value (Net Carrying Amount) |  | 97,790
U.S. Treasury and other government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-Sale Debt Securities, Amortized Cost | 23,292 | 23,562
Available-for-Sale Debt Securities, Gross Unrealized Gains | 26 | 39
Available-for-Sale Debt Securities, Gross Unrealized Losses | (535) | (552)
Available-for-Sale Debt Securities, Fair Value (Net Carrying Amount) | 22,783 | 23,049
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-Sale Debt Securities, Amortized Cost | 411 | 432
Available-for-Sale Debt Securities, Gross Unrealized Gains | 29 | 43
Available-for-Sale Debt Securities, Gross Unrealized Losses |  | (8)
Available-for-Sale Debt Securities, Fair Value (Net Carrying Amount) | $ 440 | $ 467

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