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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | Feb. 28, 2017 | May 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 158,781 | $ 151,616
Available-for-Sale Securities, Gross Unrealized Gains | 6,016 | 5,522
Available-for-Sale Securities, Gross Unrealized Losses | (5,602) | (10,182)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 159,195 | 146,956
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 135,567 | 129,025
Available-for-Sale Securities, Gross Unrealized Gains | 5,843 | 5,171
Available-for-Sale Securities, Gross Unrealized Losses | (5,311) | (10,102)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 136,099 | 124,094
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 5,700 | 5,051
Available-for-Sale Securities, Gross Unrealized Gains | 231 | 439
Available-for-Sale Securities, Gross Unrealized Losses | (155) | (247)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 5,776 | 5,243
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 30,690 | 27,717
Available-for-Sale Securities, Gross Unrealized Gains | 3,054 | 3,831
Available-for-Sale Securities, Gross Unrealized Losses | (975) | (911)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 32,769 | 30,637
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 35,144 | 35,903
Available-for-Sale Securities, Gross Unrealized Gains | 1,001 | 802
Available-for-Sale Securities, Gross Unrealized Losses | (1,765) | (4,357)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 34,380 | 32,348
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 64,033 | 60,354
Available-for-Sale Securities, Gross Unrealized Gains | 1,557 | 99
Available-for-Sale Securities, Gross Unrealized Losses | (2,416) | (4,587)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 63,174 | 55,866
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 23,214 | 22,591
Available-for-Sale Securities, Gross Unrealized Gains | 173 | 351
Available-for-Sale Securities, Gross Unrealized Losses | (291) | (80)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 23,096 | 22,862
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,499 | 21,704
Available-for-Sale Securities, Gross Unrealized Gains | 76 | 214
Available-for-Sale Securities, Gross Unrealized Losses | (283) | (80)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,292 | 21,838
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 715 | 887
Available-for-Sale Securities, Gross Unrealized Gains | 97 | 137
Available-for-Sale Securities, Gross Unrealized Losses | (8) |
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 804 | $ 1,024

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