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Credit Losses - Schedule of Fair Value and Unrealized Losses on Available for Sale Debt Securities (Detail) - USD ($) $ in Thousands | Jan. 31, 2023 | 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 | $ 13,567 | $ 37,002
Less than 12 months, unrealized losses | 78 | 125
12 months or longer, fair value | 2,648 | 4,499
12 months or longer, unrealized losses | 1 | 1
Commercial paper | Cash and Cash Equivalent |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Cash and Cash Equivalent | 0 | 15,489
Commercial paper | Marketable Securities, Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Marketable Securities, Current | 16,215 | 26,012
Commercial paper | Marketable Securities, Non- Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Marketable Securities, Non- Current | 0 | 0
Corporate notes/bonds |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Less than 12 months, fair value | 13,454 | 32,186
Less than 12 months, unrealized losses | 211 | 446
12 months or longer, fair value | 14,160 | 3,800
12 months or longer, unrealized losses | 278 | 4
Corporate notes/bonds | Cash and Cash Equivalent |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Cash and Cash Equivalent | 0 | 0
Corporate notes/bonds | Marketable Securities, Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Marketable Securities, Current | 20,311 | 18,942
Corporate notes/bonds | Marketable Securities, Non- Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Marketable Securities, Non- Current | $ 7,303 | 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 |  | 987
Less than 12 months, unrealized losses |  | 8
12 months or longer, fair value |  | 0
12 months or longer, unrealized losses |  | 0
U.S. Treasury and Agency Securities | Cash and Cash Equivalent |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Cash and Cash Equivalent |  | 0
U.S. Treasury and Agency Securities | Marketable Securities, Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Marketable Securities, Current |  | 987
U.S. Treasury and Agency Securities | Marketable Securities, Non- Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Marketable Securities, Non- Current |  | $ 0

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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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