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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | Aug. 31, 2018 | May 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 172,881 | $ 169,950
Available-for-Sale Securities, Gross Unrealized Gains | 6,132 | 2,648
Available-for-Sale Securities, Gross Unrealized Losses | (4,975) | (4,527)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 174,038 | 168,071
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 147,980 | 145,956
Available-for-Sale Securities, Gross Unrealized Gains | 6,051 | 2,566
Available-for-Sale Securities, Gross Unrealized Losses | (4,471) | (3,967)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 149,560 | 144,555
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 47,736 | 46,123
Available-for-Sale Securities, Gross Unrealized Gains | 1,241 | 1,839
Available-for-Sale Securities, Gross Unrealized Losses | (2,163) | (1,197)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 46,814 | 46,765
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 100,244 | 99,833
Available-for-Sale Securities, Gross Unrealized Gains | 4,810 | 727
Available-for-Sale Securities, Gross Unrealized Losses | (2,308) | (2,770)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 102,746 | 97,790
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 24,901 | 23,994
Available-for-Sale Securities, Gross Unrealized Gains | 81 | 82
Available-for-Sale Securities, Gross Unrealized Losses | (504) | (560)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 24,478 | 23,516
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 24,479 | 23,562
Available-for-Sale Securities, Gross Unrealized Gains | 42 | 39
Available-for-Sale Securities, Gross Unrealized Losses | (494) | (552)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 24,027 | 23,049
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 422 | 432
Available-for-Sale Securities, Gross Unrealized Gains | 39 | 43
Available-for-Sale Securities, Gross Unrealized Losses | (10) | (8)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 451 | $ 467

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