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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | Nov. 30, 2017 | May 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 168,890 | $ 163,113
Available-for-Sale Securities, Gross Unrealized Gains | 7,471 | 4,847
Available-for-Sale Securities, Gross Unrealized Losses | (2,602) | (3,505)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 173,759 | 164,455
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 144,672 | 140,231
Available-for-Sale Securities, Gross Unrealized Gains | 7,320 | 4,630
Available-for-Sale Securities, Gross Unrealized Losses | (2,253) | (3,322)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 149,739 | 141,539
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,800 | 2,391
Available-for-Sale Securities, Gross Unrealized Gains | 77 | 76
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 1,877 | 2,467
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 100,971 | 102,671
Available-for-Sale Securities, Gross Unrealized Gains | 4,282 | 2,084
Available-for-Sale Securities, Gross Unrealized Losses | (2,042) | (3,118)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 103,211 | 101,637
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 41,901 | 35,169
Available-for-Sale Securities, Gross Unrealized Gains | 2,961 | 2,470
Available-for-Sale Securities, Gross Unrealized Losses | (211) | (204)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 44,651 | 37,435
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 24,218 | 22,882
Available-for-Sale Securities, Gross Unrealized Gains | 151 | 217
Available-for-Sale Securities, Gross Unrealized Losses | (349) | (183)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 24,020 | 22,916
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 23,567 | 22,176
Available-for-Sale Securities, Gross Unrealized Gains | 66 | 120
Available-for-Sale Securities, Gross Unrealized Losses | (343) | (177)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 23,290 | 22,119
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 651 | 706
Available-for-Sale Securities, Gross Unrealized Gains | 85 | 97
Available-for-Sale Securities, Gross Unrealized Losses | (6) | (6)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 730 | $ 797

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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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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