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Summary of Available-for-Sale Debt Securities by Asset Type (Detail) - USD ($) $ in Thousands | May 31, 2023 | May 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-Sale Debt Securities, Amortized Cost | $ 28,988 | $ 26,669
Available-for-Sale Debt Securities, Gross Unrealized Gains | 29 | 67
Available-for-Sale Debt Securities, Gross Unrealized Losses | (1,855) | (1,342)
Available-for-Sale Debt Securities, Fair Value (Net Carrying Amount) | 27,162 | 25,394
U.S. Treasury and other government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-Sale Debt Securities, Amortized Cost | 28,841 | 26,522
Available-for-Sale Debt Securities, Gross Unrealized Gains | 23 | 55
Available-for-Sale Debt Securities, Gross Unrealized Losses | (1,843) | (1,338)
Available-for-Sale Debt Securities, Fair Value (Net Carrying Amount) | 27,021 | 25,239
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-Sale Debt Securities, Amortized Cost | 147 | 147
Available-for-Sale Debt Securities, Gross Unrealized Gains | 6 | 12
Available-for-Sale Debt Securities, Gross Unrealized Losses | (12) | (4)
Available-for-Sale Debt Securities, Fair Value (Net Carrying Amount) | $ 141 | $ 155

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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