Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 31, 2020	Oct. 31, 2019
Schedule Of Accrued Liabilities [Line Items]
Product warranty expense	$ 0.1	$ 0.1
Loss reserve on service agreements	5.5	3.3
Bridgeport Fuel Cell Project [Member]
Schedule Of Accrued Liabilities [Line Items]
Reserve for performance guarantees on service agreements and PPA's	$ 0.8	$ 1.4

The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(3,4))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

Name:	us-gaap_ProductWarrantyExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration