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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | Aug. 31, 2017 | May 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 144,769 | $ 163,113
Available-for-Sale Securities, Gross Unrealized Gains | 4,525 | 4,847
Available-for-Sale Securities, Gross Unrealized Losses | (3,381) | (3,505)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 145,913 | 164,455
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 121,939 | 140,231
Available-for-Sale Securities, Gross Unrealized Gains | 4,288 | 4,630
Available-for-Sale Securities, Gross Unrealized Losses | (3,205) | (3,322)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 123,022 | 141,539
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 2,110 | 2,391
Available-for-Sale Securities, Gross Unrealized Gains | 76 | 76
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 2,186 | 2,467
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 92,075 | 102,671
Available-for-Sale Securities, Gross Unrealized Gains | 1,749 | 2,084
Available-for-Sale Securities, Gross Unrealized Losses | (2,987) | (3,118)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 90,837 | 101,637
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 27,754 | 35,169
Available-for-Sale Securities, Gross Unrealized Gains | 2,463 | 2,470
Available-for-Sale Securities, Gross Unrealized Losses | (218) | (204)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 29,999 | 37,435
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,830 | 22,882
Available-for-Sale Securities, Gross Unrealized Gains | 237 | 217
Available-for-Sale Securities, Gross Unrealized Losses | (176) | (183)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,891 | 22,916
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,170 | 22,176
Available-for-Sale Securities, Gross Unrealized Gains | 140 | 120
Available-for-Sale Securities, Gross Unrealized Losses | (170) | (177)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,140 | 22,119
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 660 | 706
Available-for-Sale Securities, Gross Unrealized Gains | 97 | 97
Available-for-Sale Securities, Gross Unrealized Losses | (6) | (6)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 751 | $ 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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