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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | Feb. 29, 2016 | May. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 148,661 | $ 149,864
Available-for-Sale Securities, Gross Unrealized Gains | 4,163 | 8,721
Available-for-Sale Securities, Gross Unrealized Losses | (17,040) | (3,815)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 135,784 | 154,770
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 125,922 | 127,189
Available-for-Sale Securities, Gross Unrealized Gains | 3,786 | 8,330
Available-for-Sale Securities, Gross Unrealized Losses | (16,830) | (3,653)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 112,878 | 131,866
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 4,297 | 3,722
Available-for-Sale Securities, Gross Unrealized Gains | 257 | 339
Available-for-Sale Securities, Gross Unrealized Losses | (496) | (85)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 4,058 | 3,976
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 27,596 | 34,368
Available-for-Sale Securities, Gross Unrealized Gains | 2,899 | 5,649
Available-for-Sale Securities, Gross Unrealized Losses | (1,952) | (559)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 28,543 | 39,458
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 35,855 | 32,657
Available-for-Sale Securities, Gross Unrealized Gains | 620 | 2,114
Available-for-Sale Securities, Gross Unrealized Losses | (7,072) | (230)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 29,403 | 34,541
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 58,174 | 56,442
Available-for-Sale Securities, Gross Unrealized Gains | 10 | 228
Available-for-Sale Securities, Gross Unrealized Losses | (7,310) | (2,779)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 50,874 | 53,891
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,739 | 22,675
Available-for-Sale Securities, Gross Unrealized Gains | 377 | 391
Available-for-Sale Securities, Gross Unrealized Losses | (210) | (162)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,906 | 22,904
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 21,777 | 21,340
Available-for-Sale Securities, Gross Unrealized Gains | 232 | 171
Available-for-Sale Securities, Gross Unrealized Losses | (210) | (162)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 21,799 | 21,349
Fixed maturity | Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 18 | 81
Available-for-Sale Securities, Gross Unrealized Gains | 22 | 47
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 40 | 128
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
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 944 | 1,218
Available-for-Sale Securities, Gross Unrealized Gains | 123 | 171
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 1,067 | $ 1,389

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