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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | Feb. 28, 2018 | May 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 176,380 | $ 163,113
Available-for-Sale Securities, Gross Unrealized Gains | 5,257 | 4,847
Available-for-Sale Securities, Gross Unrealized Losses | (3,837) | (3,505)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 177,800 | 164,455
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 153,075 | 140,231
Available-for-Sale Securities, Gross Unrealized Gains | 5,179 | 4,630
Available-for-Sale Securities, Gross Unrealized Losses | (3,237) | (3,322)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 155,017 | 141,539
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,235 | 2,391
Available-for-Sale Securities, Gross Unrealized Gains | 76 | 76
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 1,311 | 2,467
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 106,443 | 102,671
Available-for-Sale Securities, Gross Unrealized Gains | 1,874 | 2,084
Available-for-Sale Securities, Gross Unrealized Losses | (2,938) | (3,118)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 105,379 | 101,637
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 45,397 | 35,169
Available-for-Sale Securities, Gross Unrealized Gains | 3,229 | 2,470
Available-for-Sale Securities, Gross Unrealized Losses | (299) | (204)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 48,327 | 37,435
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 23,305 | 22,882
Available-for-Sale Securities, Gross Unrealized Gains | 78 | 217
Available-for-Sale Securities, Gross Unrealized Losses | (600) | (183)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,783 | 22,916
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,773 | 22,176
Available-for-Sale Securities, Gross Unrealized Gains | 29 | 120
Available-for-Sale Securities, Gross Unrealized Losses | (593) | (177)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,209 | 22,119
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 532 | 706
Available-for-Sale Securities, Gross Unrealized Gains | 49 | 97
Available-for-Sale Securities, Gross Unrealized Losses | (7) | (6)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 574 | $ 797

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