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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
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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 |

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