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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | May 31, 2016 | May 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 151,616 | $ 149,864
Available-for-Sale Securities, Gross Unrealized Gains | 5,522 | 8,721
Available-for-Sale Securities, Gross Unrealized Losses | (10,182) | (3,815)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 146,956 | 154,770
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 129,025 | 127,189
Available-for-Sale Securities, Gross Unrealized Gains | 5,171 | 8,330
Available-for-Sale Securities, Gross Unrealized Losses | (10,102) | (3,653)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 124,094 | 131,866
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 5,051 | 3,722
Available-for-Sale Securities, Gross Unrealized Gains | 439 | 339
Available-for-Sale Securities, Gross Unrealized Losses | (247) | (85)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 5,243 | 3,976
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 27,717 | 34,368
Available-for-Sale Securities, Gross Unrealized Gains | 3,831 | 5,649
Available-for-Sale Securities, Gross Unrealized Losses | (911) | (559)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 30,637 | 39,458
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 35,903 | 32,657
Available-for-Sale Securities, Gross Unrealized Gains | 802 | 2,114
Available-for-Sale Securities, Gross Unrealized Losses | (4,357) | (230)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 32,348 | 34,541
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 60,354 | 56,442
Available-for-Sale Securities, Gross Unrealized Gains | 99 | 228
Available-for-Sale Securities, Gross Unrealized Losses | (4,587) | (2,779)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 55,866 | 53,891
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,591 | 22,675
Available-for-Sale Securities, Gross Unrealized Gains | 351 | 391
Available-for-Sale Securities, Gross Unrealized Losses | (80) | (162)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,862 | 22,904
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 21,704 | 21,340
Available-for-Sale Securities, Gross Unrealized Gains | 214 | 171
Available-for-Sale Securities, Gross Unrealized Losses | (80) | (162)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 21,838 | 21,349
Fixed maturity | Foreign bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost |  | 36
Available-for-Sale Securities, Gross Unrealized Gains |  | 2
Available-for-Sale Securities, Fair Value (Net Carrying Amount) |  | 38
Fixed maturity | Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost |  | 81
Available-for-Sale Securities, Gross Unrealized Gains |  | 47
Available-for-Sale Securities, Fair Value (Net Carrying Amount) |  | 128
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 887 | 1,218
Available-for-Sale Securities, Gross Unrealized Gains | 137 | 171
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 1,024 | $ 1,389

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