Segmented Information - Additional Information (Detail) $ in Thousands	12 Months Ended
Apr. 30, 2020 CAD ($) Segment	Apr. 30, 2019 CAD ($)
Disclosure Of Operating Segments [Abstract]
Number of reportable geographical segment	3
Number of operating segment	1
Trade receivables \| $	$ 736	$ 514

The amount due from customers for goods and services sold.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_TradeReceivables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant