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v3.20.1

Investments - Auction rate securities (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2020 USD ($)
Available-For-Sale Securities |
Fair value | $ 15,030
Minimum |
Available For Sale Securities |
Maturity period of available-for-sale securities | 1 year
Maximum |
Available For Sale Securities |
Maturity period of available-for-sale securities | 16 years

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26626-111562 + Details
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