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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | Aug. 31, 2015 | May. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 147,533 | $ 149,864
Available-for-Sale Securities, Gross Unrealized Gains | 4,207 | 8,721
Available-for-Sale Securities, Gross Unrealized Losses | (9,777) | (3,815)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 141,963 | 154,770
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 125,037 | 127,189
Available-for-Sale Securities, Gross Unrealized Gains | 3,918 | 8,330
Available-for-Sale Securities, Gross Unrealized Losses | (9,598) | (3,653)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 119,357 | 131,866
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 4,201 | 3,722
Available-for-Sale Securities, Gross Unrealized Gains | 193 | 339
Available-for-Sale Securities, Gross Unrealized Losses | (415) | (85)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 3,979 | 3,976
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 31,465 | 34,368
Available-for-Sale Securities, Gross Unrealized Gains | 2,757 | 5,649
Available-for-Sale Securities, Gross Unrealized Losses | (1,004) | (559)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 33,218 | 39,458
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 32,681 | 32,657
Available-for-Sale Securities, Gross Unrealized Gains | 959 | 2,114
Available-for-Sale Securities, Gross Unrealized Losses | (2,702) | (230)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 30,938 | 34,541
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 56,690 | 56,442
Available-for-Sale Securities, Gross Unrealized Gains | 9 | 228
Available-for-Sale Securities, Gross Unrealized Losses | (5,477) | (2,779)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 51,222 | 53,891
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,496 | 22,675
Available-for-Sale Securities, Gross Unrealized Gains | 289 | 391
Available-for-Sale Securities, Gross Unrealized Losses | (179) | (162)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,606 | 22,904
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 21,187 | 21,340
Available-for-Sale Securities, Gross Unrealized Gains | 111 | 171
Available-for-Sale Securities, Gross Unrealized Losses | (179) | (162)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 21,119 | 21,349
Fixed maturity | Foreign bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 36 | 36
Available-for-Sale Securities, Gross Unrealized Gains | 2 | 2
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 38 | 38
Fixed maturity | Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 59 | 81
Available-for-Sale Securities, Gross Unrealized Gains | 37 | 47
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 96 | 128
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,214 | 1,218
Available-for-Sale Securities, Gross Unrealized Gains | 139 | 171
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 1,353 | $ 1,389

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