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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, 2022 | Apr. 30, 2022
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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 | $ 33,831 | $ 37,002
Less Than 12 Months, Unrealized Loss | 178 | 125
12 Months or longer, Fair Value | 1,698 | 4,499
12 Months or longer, Unrealized Losses | 2 | 1
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 | 35,529 | 26,012
Commercial Paper | Cash and Cash Equivalents |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Fair Value |  | 15,489
Corporate Notes/Bonds |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 31,566 | 32,186
Less Than 12 Months, Unrealized Loss | 447 | 446
12 Months or longer, Fair Value | 9,153 | 3,800
12 Months or longer, Unrealized Losses | 23 | 4
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 | 24,137 | 18,942
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 | 16,582 | 17,044
U.S. Treasury and Agency Securities |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 986 | 987
Less Than 12 Months, Unrealized Loss | 10 | 8
U.S. Treasury and Agency Securities | Marketable Securities Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Available For Sale Securities Debt Securities, Current | $ 986 | $ 987

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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 https://asc.fasb.org/extlink&oid=126897435&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 https://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 https://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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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