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Revenue Recognition and Contracts with Customers - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Disaggregation Of Revenue [Line Items] |  |  |
Revenue recognized | $ 15,000 | $ 48,600 |
Deferred revenue recognized |  | 13,700 | $ 10,500
Additional deferred revenue for outstanding performance obligations | 3,100 | 51,100 |
Net increase (decrease) of revenue | 11,800 | (2,500) |
ASU 2014-09 |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue recognized | (14,957) | (48,576) |
Additional deferred revenue for outstanding performance obligations | $ 3,120 | $ 51,107 |
Total Net Sales | ASU 2014-09 | Geographic Concentration Risk | Domestic |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Concentration risk percentage | 98.00% |  |

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