Segmented Information - Additional Information (Detail)	12 Months Ended
Apr. 30, 2019 CAD ($) Segments	Apr. 30, 2018 CAD ($)
Disclosure of operating segments [abstract]
Number of reportable geographical segment	3
Number of operating segment	1
Trade receivables \| $	$ 514,000	$ 0

The amount due from customers for goods and services sold.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard
-URIDate 2018-03-16

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