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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2020 | Sep. 14, 2020 | Jun. 28, 2020 | Apr. 27, 2020 | Apr. 30, 2021
Commitments And Contingencies [Line Items] |  |  |  |  |
Recorded unconditional purchase obligation |  |  |  |  | $ 73.9
Loss contingency, damages sought | $ 880.0 |  |  |  |
Accounts receivable outstanding |  |  |  |  | 8.0
Posco Energy [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Loss contingency, damages sought |  |  | $ 200.0 | $ 3.3 |
Unspecified warranty claims |  |  |  | 7.0 |
License termination |  |  |  | $ 110.0 |
Bond amount |  |  |  |  | $ 46.0
Loss contingency, claimed Loss |  | $ 1.0 |  |  |

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