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Commitments and contingencies - Schedule of performance milestones (Details) - Amended and restated licensing agreement [Member] - Aerialx Technology [Member]
$ in Millions
12 Months Ended
Sep. 30, 2022
CAD ($)
shares
First milestone [Member]  
Disclosure of contingent liabilities [line items]  
Number of Common Shares | shares 1,071
Milestone, amount in sales | $ $ 3
Second milestone [Member]  
Disclosure of contingent liabilities [line items]  
Number of Common Shares | shares 1,429
Milestone, amount in sales | $ $ 9
Third milestone [Member]  
Disclosure of contingent liabilities [line items]  
Number of Common Shares | shares 1,786
Milestone, amount in sales | $ $ 18