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Cost optimization program (Details) - CAD ($)
 12 Months Ended 18 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Mar. 31, 2024
Disclosure of attribution of expenses by nature to their function [line items]      
Cost optimization program $ 91,063,000 $ 8,964,000 $ 100,027,000
Cost optimization program      
Disclosure of attribution of expenses by nature to their function [line items]      
Termination of employment costs 69,500,000 2,613,000  
Cost of vacating leased premises 21,563,000 6,351,000  
Impairment of right-of-use assets 10,119,000 2,232,000  
Onerous contracts expense 9,013,000 2,181,000  
Impairment loss $ 2,431,000 $ 1,938,000