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Summary of Marketable Securities by Asset Type (Detail) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2013 | May 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 108,429 | $ 105,483
Available-for-Sale Securities, Gross Unrealized Gains | 7,786 | 8,644
Available-for-Sale Securities, Gross Unrealized Losses | (2,365) | (1,034)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 113,850 | 113,093
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 86,204 | 83,094
Available-for-Sale Securities, Gross Unrealized Gains | 7,367 | 8,089
Available-for-Sale Securities, Gross Unrealized Losses | (2,023) | (891)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 91,548 | 90,292
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,090 | 1,090
Available-for-Sale Securities, Gross Unrealized Gains | 367 | 244
Available-for-Sale Securities, Gross Unrealized Losses | (47) |
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 1,410 | 1,334
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 30,931 | 24,492
Available-for-Sale Securities, Gross Unrealized Gains | 4,749 | 5,265
Available-for-Sale Securities, Gross Unrealized Losses | (488) | (392)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 35,192 | 29,365
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 26,348 | 18,328
Available-for-Sale Securities, Gross Unrealized Gains | 2,018 | 1,901
Available-for-Sale Securities, Gross Unrealized Losses | (148) | (7)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 28,218 | 20,222
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 27,835 | 39,184
Available-for-Sale Securities, Gross Unrealized Gains | 233 | 679
Available-for-Sale Securities, Gross Unrealized Losses | (1,340) | (492)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 26,728 | 39,371
Fixed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,225 | 22,389
Available-for-Sale Securities, Gross Unrealized Gains | 419 | 555
Available-for-Sale Securities, Gross Unrealized Losses | (342) | (143)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,302 | 22,801
Fixed securities | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 20,386 | 20,528
Available-for-Sale Securities, Gross Unrealized Gains | 166 | 247
Available-for-Sale Securities, Gross Unrealized Losses | (341) | (139)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 20,211 | 20,636
Fixed securities | Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,714 | 1,724
Available-for-Sale Securities, Gross Unrealized Gains | 192 | 244
Available-for-Sale Securities, Gross Unrealized Losses | (1) |
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 | 88 | 100
Available-for-Sale Securities, Gross Unrealized Gains | 58 | 60
Available-for-Sale Securities, Gross Unrealized Losses |  | (4)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 146 | $ 156

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