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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | May. 31, 2015 | May. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 149,864 | $ 129,660
Available-for-Sale Securities, Gross Unrealized Gains | 8,721 | 14,645
Available-for-Sale Securities, Gross Unrealized Losses | (3,815) | (1,425)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 154,770 | 142,880
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 127,189 | 106,838
Available-for-Sale Securities, Gross Unrealized Gains | 8,330 | 14,223
Available-for-Sale Securities, Gross Unrealized Losses | (3,653) | (1,261)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 131,866 | 119,800
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 3,722 | 984
Available-for-Sale Securities, Gross Unrealized Gains | 339 | 669
Available-for-Sale Securities, Gross Unrealized Losses | (85) | (20)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 3,976 | 1,633
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 34,368 | 31,071
Available-for-Sale Securities, Gross Unrealized Gains | 5,649 | 8,965
Available-for-Sale Securities, Gross Unrealized Losses | (559) | (132)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 39,458 | 39,904
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 32,657 | 30,541
Available-for-Sale Securities, Gross Unrealized Gains | 2,114 | 2,799
Available-for-Sale Securities, Gross Unrealized Losses | (230) |
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 34,541 | 33,340
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 56,442 | 44,242
Available-for-Sale Securities, Gross Unrealized Gains | 228 | 1,790
Available-for-Sale Securities, Gross Unrealized Losses | (2,779) | (1,109)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 53,891 | 44,923
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,675 | 22,822
Available-for-Sale Securities, Gross Unrealized Gains | 391 | 422
Available-for-Sale Securities, Gross Unrealized Losses | (162) | (164)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,904 | 23,080
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 21,340 | 21,156
Available-for-Sale Securities, Gross Unrealized Gains | 171 | 152
Available-for-Sale Securities, Gross Unrealized Losses | (162) | (164)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 21,349 | 21,144
Fixed maturity | Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,218 | 1,544
Available-for-Sale Securities, Gross Unrealized Gains | 171 | 212
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 1,389 | 1,756
Fixed maturity | Foreign bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 36 | 37
Available-for-Sale Securities, Gross Unrealized Gains | 2 | 3
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 38 | 40
Fixed maturity | Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 81 | 85
Available-for-Sale Securities, Gross Unrealized Gains | 47 | 55
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 128 | $ 140

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