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Summary of Marketable Securities by Asset Type (Detail) (USD $) In Thousands, unless otherwise specified | Nov. 30, 2013 | May 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 120,665 | $ 105,483
Available-for-Sale Securities, Gross Unrealized Gains | 16,140 | 8,644
Available-for-Sale Securities, Gross Unrealized Losses | (1,581) | (1,034)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 135,224 | 113,093
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 99,237 | 83,094
Available-for-Sale Securities, Gross Unrealized Gains | 15,721 | 8,089
Available-for-Sale Securities, Gross Unrealized Losses | (1,295) | (891)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 113,663 | 90,292
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 372 | 1,090
Available-for-Sale Securities, Gross Unrealized Gains | 107 | 244
Available-for-Sale Securities, Gross Unrealized Losses | (39) |
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 440 | 1,334
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 31,849 | 24,492
Available-for-Sale Securities, Gross Unrealized Gains | 7,947 | 5,265
Available-for-Sale Securities, Gross Unrealized Losses | (239) | (392)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 39,557 | 29,365
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 26,367 | 18,328
Available-for-Sale Securities, Gross Unrealized Gains | 5,535 | 1,901
Available-for-Sale Securities, Gross Unrealized Losses |  | (7)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 31,902 | 20,222
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 40,649 | 39,184
Available-for-Sale Securities, Gross Unrealized Gains | 2,132 | 679
Available-for-Sale Securities, Gross Unrealized Losses | (1,017) | (492)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 41,764 | 39,371
Fixed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 21,428 | 22,389
Available-for-Sale Securities, Gross Unrealized Gains | 419 | 555
Available-for-Sale Securities, Gross Unrealized Losses | (286) | (143)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 21,561 | 22,801
Fixed securities | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 19,595 | 20,528
Available-for-Sale Securities, Gross Unrealized Gains | 163 | 247
Available-for-Sale Securities, Gross Unrealized Losses | (286) | (139)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 19,472 | 20,636
Fixed securities | Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,709 | 1,724
Available-for-Sale Securities, Gross Unrealized Gains | 196 | 244
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 1,905 | 1,968
Fixed securities | Foreign bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 37 | 37
Available-for-Sale Securities, Gross Unrealized Gains | 3 | 4
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 40 | 41
Fixed securities | Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 87 | 100
Available-for-Sale Securities, Gross Unrealized Gains | 57 | 60
Available-for-Sale Securities, Gross Unrealized Losses |  | (4)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 144 | $ 156

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