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Income taxes - Schedule of net operating losses (Details) - CAD ($)
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net operating losses $ 18,589,894 $ 9,429,436 $ 4,279,494 $ 2,111,531
Net operating losses in Canada [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net operating losses 18,689,741   4,460,796  
Net operating losses in Canada [Member] | 2036 [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net operating losses 512,163   512,163  
Net operating losses in Canada [Member] | 2037 [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net operating losses 744,022   611,677  
Net operating losses in Canada [Member] | 2038 [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net operating losses 1,174,797   1,174,797  
Net operating losses in Canada [Member] | 2039 [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net operating losses 1,732,039   1,829,518  
Net operating losses in Canada [Member] | 2040 and thereafter [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net operating losses $ 14,526,720   $ 332,641