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Credit Losses - Schedule of Fair Value and Unrealized Losses on Available for Sale Debt Securities (Detail) - USD ($) $ in Thousands | Apr. 30, 2025 | Apr. 30, 2024
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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 | $ 3,841 | $ 11,040
Less than 12 months, unrealized losses | 1 | 19
12 months or longer, fair value | 0 | 0
12 months or longer, unrealized losses | 0 | 0
Commercial paper | Cash and Cash Equivalents |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Debt securities AFS, fair value | 500 | 3,932
Commercial paper | Marketable Securities, Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Debt securities, current | 3,341 | 7,108
Commercial paper | Marketable Securities, Non-Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Debt 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 | 7,803 | 11,022
Less than 12 months, unrealized losses | 10 | 26
12 months or longer, fair value | 0 | 1,999
12 months or longer, unrealized losses | 0 | 1
Corporate notes/bonds | Cash and Cash Equivalents |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Debt securities AFS, fair value | 0 | 0
Corporate notes/bonds | Marketable Securities, Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Debt securities, current | 4,630 | 9,050
Corporate notes/bonds | Marketable Securities, Non-Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Debt securities, non-current | $ 3,173 | 3,971
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 |  | 4,346
Less than 12 months, unrealized losses |  | 9
12 months or longer, fair value |  | 0
12 months or longer, unrealized losses |  | 0
U.S. Treasury and Agency Securities | Cash and Cash Equivalents |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Debt securities AFS, fair value |  | 0
U.S. Treasury and Agency Securities | Marketable Securities, Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Debt securities, current |  | 2,441
U.S. Treasury and Agency Securities | Marketable Securities, Non-Current |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Debt securities, non-current |  | $ 1,905

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