Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Goodwill [Line Items]
Goodwill impairment (recovery)		$ 0	$ 20,300,000	$ 0
Net impairment charge		$ 0		$ 0
Technical Solutions
Goodwill [Line Items]
Goodwill impairment (recovery)	$ 20,300,000		20,300,000
Customer relationships \| Technical Solutions
Goodwill [Line Items]
Net impairment charge			$ 6,200,000