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Credit Losses - Schedule of Fair Value and Unrealized Losses on Available for Sale Debt Securities (Detail) - USD ($) $ in Thousands | Jul. 31, 2021 | Apr. 30, 2021
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Commercial Paper |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 21,879 | $ 36,378
Less Than 12 Months, Unrealized Loss | 6 | 7
Commercial Paper | Cash and Cash Equivalents |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Fair Value |  | 5,749
Commercial Paper | Marketable Securities Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Available For Sale Securities Debt Securities, Current | 21,879 | 30,629
Corporate Notes/Bonds |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 31,082 | 26,350
Less Than 12 Months, Unrealized Loss | 19 | 20
Corporate Notes/Bonds | Marketable Securities Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Available For Sale Securities Debt Securities, Current | 17,087 | 10,133
Corporate Notes/Bonds | Marketable Securities Non-Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Available For Sale Securities Debt Securities, Non-Current | $ 13,995 | $ 16,217

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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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: 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=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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