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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | Nov. 30, 2016 | May 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 156,749 | $ 151,616
Available-for-Sale Securities, Gross Unrealized Gains | 4,808 | 5,522
Available-for-Sale Securities, Gross Unrealized Losses | (8,093) | (10,182)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 153,464 | 146,956
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 133,740 | 129,025
Available-for-Sale Securities, Gross Unrealized Gains | 4,628 | 5,171
Available-for-Sale Securities, Gross Unrealized Losses | (7,790) | (10,102)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 130,578 | 124,094
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 5,699 | 5,051
Available-for-Sale Securities, Gross Unrealized Gains | 229 | 439
Available-for-Sale Securities, Gross Unrealized Losses | (323) | (247)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 5,605 | 5,243
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 31,050 | 27,717
Available-for-Sale Securities, Gross Unrealized Gains | 2,086 | 3,831
Available-for-Sale Securities, Gross Unrealized Losses | (1,325) | (911)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 31,811 | 30,637
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 34,419 | 35,903
Available-for-Sale Securities, Gross Unrealized Gains | 920 | 802
Available-for-Sale Securities, Gross Unrealized Losses | (3,204) | (4,357)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 32,135 | 32,348
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 62,572 | 60,354
Available-for-Sale Securities, Gross Unrealized Gains | 1,393 | 99
Available-for-Sale Securities, Gross Unrealized Losses | (2,938) | (4,587)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 61,027 | 55,866
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 23,009 | 22,591
Available-for-Sale Securities, Gross Unrealized Gains | 180 | 351
Available-for-Sale Securities, Gross Unrealized Losses | (303) | (80)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,886 | 22,862
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,235 | 21,704
Available-for-Sale Securities, Gross Unrealized Gains | 76 | 214
Available-for-Sale Securities, Gross Unrealized Losses | (295) | (80)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,016 | 21,838
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 774 | 887
Available-for-Sale Securities, Gross Unrealized Gains | 104 | 137
Available-for-Sale Securities, Gross Unrealized Losses | (8) |
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 870 | $ 1,024

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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