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Credit Losses - Schedule of Fair Value and Unrealized Losses on Available for Sale Debt Securities (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	Apr. 30, 2021
Commercial Paper
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items]
Less Than 12 Months, Fair Value	$ 28,425	$ 36,378
Less Than 12 Months, Unrealized Loss	10	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	28,425	30,629
Corporate Notes/Bonds
Fair Value And Unrealized Losses On Available For Sale Debt Securities [Line Items]
Less Than 12 Months, Fair Value	37,206	26,350
Less Than 12 Months, Unrealized Loss	41	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	25,801	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	$ 11,405	$ 16,217

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