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Inventories - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2022 | Apr. 30, 2021 | Oct. 31, 2021 | Apr. 30, 2022
Inventory [Line Items] |  |  |  |  |  |
Fixed asset impairment charge |  |  | $ 7,200 |  | $ 2,800 | $ 10,000
Accrued product warranty cost | $ 247 |  | 247 |  | $ 72 | $ 247
Costs of Revenues |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |
Excess plant capacity and manufacturing variances cost incurred | $ 2,500 | $ 1,300 | $ 4,700 | $ 3,400 |  |

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