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Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions | Apr. 30, 2021 | Oct. 31, 2020
--- | --- | ---
Disaggregation Of Revenue [Line Items] |  |
Contract asset | $ 17.5 | $ 16.9
Contract liability | 44.2 | $ 41.9
Service Agreements [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Remaining performance obligations | 141.4 |
Licensing Agreements [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Remaining performance obligations | 22.2 |
Advanced Technologies Contracts [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Remaining performance obligations | 45.0 |
Posco Energy [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Deferred revenue | $ 22.2 |

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