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Cost optimization program (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Disclosure of attribution of expenses by nature to their function [line items]    
Cost optimization program $ 8,964,000 $ 0
Termination of employment costs 23,226,000 10,948,000
Cost optimization program    
Disclosure of attribution of expenses by nature to their function [line items]    
Termination of employment costs 2,613,000  
Cost of vacating leased premises 6,351,000  
Impairment of right-of-use assets 2,232,000 0
Onerous contracts expense 2,181,000  
Impairment loss recognised in profit or loss, property, plant and equipment $ 1,938,000 $ 0