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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | Aug. 31, 2016 | May 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 155,477 | $ 151,616
Available-for-Sale Securities, Gross Unrealized Gains | 5,216 | 5,522
Available-for-Sale Securities, Gross Unrealized Losses | (7,208) | (10,182)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 153,485 | 146,956
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 132,878 | 129,025
Available-for-Sale Securities, Gross Unrealized Gains | 4,776 | 5,171
Available-for-Sale Securities, Gross Unrealized Losses | (7,111) | (10,102)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 130,543 | 124,094
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 4,989 | 5,051
Available-for-Sale Securities, Gross Unrealized Gains | 180 | 439
Available-for-Sale Securities, Gross Unrealized Losses | (53) | (247)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 5,116 | 5,243
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 30,896 | 27,717
Available-for-Sale Securities, Gross Unrealized Gains | 2,613 | 3,831
Available-for-Sale Securities, Gross Unrealized Losses | (866) | (911)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 32,643 | 30,637
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 35,923 | 35,903
Available-for-Sale Securities, Gross Unrealized Gains | 932 | 802
Available-for-Sale Securities, Gross Unrealized Losses | (2,828) | (4,357)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 34,027 | 32,348
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 61,070 | 60,354
Available-for-Sale Securities, Gross Unrealized Gains | 1,051 | 99
Available-for-Sale Securities, Gross Unrealized Losses | (3,364) | (4,587)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 58,757 | 55,866
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,599 | 22,591
Available-for-Sale Securities, Gross Unrealized Gains | 440 | 351
Available-for-Sale Securities, Gross Unrealized Losses | (97) | (80)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,942 | 22,862
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 21,770 | 21,704
Available-for-Sale Securities, Gross Unrealized Gains | 289 | 214
Available-for-Sale Securities, Gross Unrealized Losses | (97) | (80)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 21,962 | 21,838
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 829 | 887
Available-for-Sale Securities, Gross Unrealized Gains | 151 | 137
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 980 | $ 1,024

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