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Balance Sheet Details - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Aug. 18, 2020 | May 01, 2020 | Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020
Short-term Debt [Line Items] |  |  |  |  |  |
Depreciation expense |  |  | $ 1.1 | $ 1.0 | $ 2.2 | $ 2.0
Paycheck Protection Program, CARES Act |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Loan proceeds, promissory note |  | $ 6.3 |  |  |  |
Repayment of loan, promissory note, interest | $ 0.1 |  |  |  |  |
Repayment of loan, promissory note | $ 6.4 |  |  |  |  |

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