Schedule of Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Millions	9 Months Ended
Jul. 31, 2019	Oct. 31, 2018
Schedule Of Accrued Liabilities [Line Items]
Product warranty accrual, payment and adjustments	$ 0.1
Loss reserve on service agreements	1.7	$ 0.9
Bridgeport Fuel Cell Project [Member]
Schedule Of Accrued Liabilities [Line Items]
Reserve for performance guarantees	$ 0.8	$ 1.1

Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(2))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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