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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, 2022 | 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 | $ 37,002 | $ 36,378
Less Than 12 Months, Unrealized Losses | 125 | 7
12 Months or longer, Fair Value | 4,499 |
12 Months or longer, Unrealized Losses | 1 |
Corporate Notes/Bonds |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 32,186 | 26,351
Less Than 12 Months, Unrealized Losses | 446 | 20
12 Months or longer, Fair Value | 3,800 |
12 Months or longer, Unrealized Losses | 4 |
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 |
Cash and Cash Equivalents | Commercial Paper |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Fair Value | 15,489 | 5,749
Marketable Securities Current | Commercial Paper |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Available For Sale Securities Debt Securities, Current | 26,012 | 30,629
Marketable Securities Current | Corporate Notes/Bonds |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Available For Sale Securities Debt Securities, Current | 18,942 | 10,134
Marketable Securities Current | U.S. Treasury and Agency Securities |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Available For Sale Securities Debt Securities, Current | 987 |
Marketable Securities Non-Current | Corporate Notes/Bonds |  |
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items] |  |
Available For Sale Securities Debt Securities, Non-Current | $ 17,044 | $ 16,217

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