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Net Carrying Values of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | May 31, 2020 | May 31, 2019
--- | --- | ---
Available-for-Sale Debt Securities, Amortized Cost |  |
Less than one year, amortized cost | $ 7,567 |
One year through five years, amortized cost | 10,170 |
Six years through ten years, amortized cost | 6,084 |
After ten years, amortized cost | 1,784 |
Available-for-Sale Debt Securities, Amortized Cost | 25,605 | $ 24,905
Available-for-Sale Debt Securities, Fair Value |  |
Less than one year, fair value | 7,581 |
One year through five years, fair value | 10,623 |
Six years through ten years, fair value | 6,591 |
After ten years, fair value | 2,127 |
Available-for-sale debt securities, fair value | $ 26,922 | $ 25,009

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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), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563 + Details
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