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Summary of Marketable Securities by Asset Type (Detail) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2014 | May 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 129,416 | $ 129,660
Available-for-Sale Securities, Gross Unrealized Gains | 13,059 | 14,645
Available-for-Sale Securities, Gross Unrealized Losses | (1,411) | (1,425)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 141,064 | 142,880
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 107,326 | 106,838
Available-for-Sale Securities, Gross Unrealized Gains | 12,659 | 14,223
Available-for-Sale Securities, Gross Unrealized Losses | (1,179) | (1,261)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 118,806 | 119,800
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 2,315 | 984
Available-for-Sale Securities, Gross Unrealized Gains | 887 | 669
Available-for-Sale Securities, Gross Unrealized Losses | (25) | (20)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 3,177 | 1,633
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 30,867 | 31,071
Available-for-Sale Securities, Gross Unrealized Gains | 7,704 | 8,965
Available-for-Sale Securities, Gross Unrealized Losses | (153) | (132)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 38,418 | 39,904
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 30,443 | 30,541
Available-for-Sale Securities, Gross Unrealized Gains | 2,285 | 2,799
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 32,728 | 33,340
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 43,701 | 44,242
Available-for-Sale Securities, Gross Unrealized Gains | 1,783 | 1,790
Available-for-Sale Securities, Gross Unrealized Losses | (1,001) | (1,109)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 44,483 | 44,923
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,090 | 22,822
Available-for-Sale Securities, Gross Unrealized Gains | 400 | 422
Available-for-Sale Securities, Gross Unrealized Losses | (232) | (164)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,258 | 23,080
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 20,494 | 21,156
Available-for-Sale Securities, Gross Unrealized Gains | 127 | 152
Available-for-Sale Securities, Gross Unrealized Losses | (228) | (164)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 20,393 | 21,144
Fixed maturity | Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,474 | 1,544
Available-for-Sale Securities, Gross Unrealized Gains | 219 | 212
Available-for-Sale Securities, Gross Unrealized Losses | (4) |
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 1,689 | 1,756
Fixed maturity | Foreign bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 38 | 37
Available-for-Sale Securities, Gross Unrealized Gains | 1 | 3
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 39 | 40
Fixed maturity | Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 84 | 85
Available-for-Sale Securities, Gross Unrealized Gains | 53 | 55
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 137 | $ 140

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