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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | May 31, 2017 | May 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 163,113 | $ 151,616
Available-for-Sale Securities, Gross Unrealized Gains | 4,847 | 5,522
Available-for-Sale Securities, Gross Unrealized Losses | (3,505) | (10,182)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 164,455 | 146,956
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 140,231 | 129,025
Available-for-Sale Securities, Gross Unrealized Gains | 4,630 | 5,171
Available-for-Sale Securities, Gross Unrealized Losses | (3,322) | (10,102)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 141,539 | 124,094
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 2,391 | 27,717
Available-for-Sale Securities, Gross Unrealized Gains | 76 | 3,831
Available-for-Sale Securities, Gross Unrealized Losses |  | (911)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 2,467 | 30,637
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost |  | 5,051
Available-for-Sale Securities, Gross Unrealized Gains |  | 439
Available-for-Sale Securities, Gross Unrealized Losses |  | (247)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) |  | 5,243
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 102,671 | 60,354
Available-for-Sale Securities, Gross Unrealized Gains | 2,084 | 99
Available-for-Sale Securities, Gross Unrealized Losses | (3,118) | (4,587)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 101,637 | 55,866
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 35,169 | 35,903
Available-for-Sale Securities, Gross Unrealized Gains | 2,470 | 802
Available-for-Sale Securities, Gross Unrealized Losses | (204) | (4,357)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 37,435 | 32,348
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,882 | 22,591
Available-for-Sale Securities, Gross Unrealized Gains | 217 | 351
Available-for-Sale Securities, Gross Unrealized Losses | (183) | (80)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,916 | 22,862
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,176 | 21,704
Available-for-Sale Securities, Gross Unrealized Gains | 120 | 214
Available-for-Sale Securities, Gross Unrealized Losses | (177) | (80)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,119 | 21,838
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 706 | 887
Available-for-Sale Securities, Gross Unrealized Gains | 97 | 137
Available-for-Sale Securities, Gross Unrealized Losses | (6) |
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 797 | $ 1,024

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