Commitments, contingencies and guarantees - Guarantees (Details) $ in Thousands	Sep. 30, 2022 CAD ($)
Disclosure of contingent liabilities [line items]
Letters of credit in addition to the letters of credit covered by the unsecured committed revolving credit facility	$ 67,566
Liability for refusal or failure to perform under bid and performance bonds \| Guarantees
Disclosure of contingent liabilities [line items]
Maximum potential exposure if specified in agreement	$ 19,259

The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2021-01-01
-Paragraph 86
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_86_a&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_EstimatedFinancialEffectOfContingentLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant