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Revenue - Customer Concentration and Accounts Receivable (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020 | Apr. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |  |
Unbilled receivables | $ 7.3 |  | $ 7.3 |  | $ 3.8
Customer Concentration Risk | Revenue | Customer One |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer concentration risk, percentage | 28.00% | 16.00% | 25.00% | 17.00% |
Customer Concentration Risk | Revenue | Customer Two |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer concentration risk, percentage | 11.00% | 13.00% | 12.00% | 12.00% |
Customer Concentration Risk | Accounts Receivable | Customer One |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer concentration risk, percentage |  |  | 16.00% |  | 18.00%
Customer Concentration Risk | Accounts Receivable | Customer Two |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer concentration risk, percentage |  |  | 15.00% |  | 14.00%
Customer Concentration Risk | Accounts Receivable | Customer Three |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer concentration risk, percentage |  |  | 14.00% |  | 14.00%
Customer Concentration Risk | Accounts Receivable | Customer Four |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Customer concentration risk, percentage |  |  | 12.00% |  | 11.00%

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