Segment reporting - Additional Information (Detail) - Customer One [member]	12 Months Ended
Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Disclosure of operating segments [line items]
Percentage of entities revenue	66.00%	0.00%	0.00%
Percentage of accounts receivable	58.00%	0.00%	0.00%

The percentage of the entity's revenue. [Refer: Revenue]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 8
-IssueDate 2020-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_34&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_PercentageOfEntitysRevenue
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration