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Summary of material accounting policies - Disclosure of estimated useful lives of property, plant and equipment (Details)
 12 Months Ended
Sep. 30, 2023
Minimum | Buildings  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life 10 years
Minimum | Furniture, fixtures and equipment  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life 3 years
Minimum | Computer equipment  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life 3 years
Maximum | Buildings  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life 40 years
Maximum | Furniture, fixtures and equipment  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life 20 years
Maximum | Computer equipment  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life 5 years