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Project Assets - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 USD ($) | Apr. 30, 2020 USD ($) | Apr. 30, 2021 USD ($) item | Apr. 30, 2020 USD ($) | Oct. 31, 2020 USD ($) item
Project Assets [Abstract] |  |  |  |  |
Number of project assets | item |  |  | 8 |  | 8
Sale leaseback transaction, net book value | $ 89.3 |  | $ 89.3 |  | $ 70.5
Project asset depreciation | 3.3 | $ 2.8 | 7.3 | $ 5.8 |
Long-term project assets construction in progress | 97.9 |  | 97.9 |  | 91.3
PPA assets construction in progress | $ 4.8 |  | $ 4.8 |  | $ 4.8

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- Definition The net book value of the asset(s) sold in connection with the sale of the property to another party and lease back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=121602674&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 40 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121606570&loc=SL77919786-209982 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=121602674&loc=d3e51843-112757 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=121602674&loc=d3e51831-112757 + Details
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