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Related party transactions (Narrative) (Details) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 28, 2022 | Jul. 31, 2022 CAD ($) shares | Apr. 30, 2021 CAD ($) shares | Sep. 30, 2020 CAD ($) shares | Sep. 30, 2022 CAD ($) shares | Sep. 30, 2021 CAD ($) shares | Dec. 31, 2019 CAD ($) shares | Aug. 31, 2022 CAD ($) | Mar. 31, 2022 CAD ($) shares | Aug. 31, 2021 shares | Aug. 31, 2020 shares | Oct. 23, 2019 CAD ($) | Sep. 30, 2019 shares | Dec. 31, 2018 CAD ($) shares | Dec. 14, 2018 CAD ($) | Jun. 05, 2018 CAD ($) | Jun. 05, 2018 USD ($) | Apr. 20, 2018 CAD ($)
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of reverse stock split | 1-for-70 Reverse Split |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 32,273 | $ 2,278,774 | $ 53,251 | $ 0 |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  | $ 90,474 | $ 511,990 | $ 116,113 |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants outstanding | shares |  |  |  | 9,585,050 | 13,417,156 | 13,901,640 | 8,500,000 |  |  | 13,901,640 | 9,585,050 |  | 8,500,000 | 0 |  |  |  |
Amounts payable, related party transactions |  |  |  | $ 218,276 |  | $ 0 | $ 289,828 |  |  |  |  |  |  | $ 885,213 |  |  |  |
Cash and share-based remuneration amount |  |  |  | 335,728 | $ 2,101,267 | 1,680,968 | 78,343 |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  | $ 24,959 | $ 860,400 | $ 988,716 | 0 |  |  |  |  |  |  |  |  |  |  |
Key management personnel of KWESST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of issued and outstanding common shares |  |  |  | 38.00% | 28.30% | 31.50% |  |  |  |  |  |  |  |  |  |  |  |
Prior year expenses payment |  |  |  | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  | $ 6,585 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants outstanding | shares |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options outstanding | shares |  |  |  | 2,857 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and share-based remuneration amount |  |  |  | $ 494,325 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans from CEO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  | The loans are due on demand and accrue annual interest at TD Bank prime plus 1.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 1.55% |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts payable, related party transactions |  |  |  | $ 207,092 |  | $ 0 | 229,918 |  |  |  |  |  |  | 612,171 |  |  |  |
Employee loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of issued and outstanding common shares |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts payable, related party transactions |  |  |  | $ 11,184 |  | $ 0 | 59,910 |  |  |  |  |  |  | 81,253 |  |  |  |
Two directors and CFO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units issued | shares |  |  | 1,029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuing units |  |  | $ 90,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Two directors, Executive Chairman and CFO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 74,000 |  |  |  |  |  |  |  |  |
Bonus common shares | shares |  |  |  |  |  |  |  |  | 529 |  |  |  |  |  |  |  |  |
Director, Executive Chairman and CFO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units issued | shares |  | 5,813 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuing units |  | $ 87,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Executive Chairman and CFO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts payable, related party transactions |  |  |  |  |  |  |  | $ 60,000 |  |  |  |  |  |  |  |  |  |
Officers and directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts payable, related party transactions |  |  |  |  | $ 672,531 |  |  |  |  |  |  |  |  |  |  |  |  |
Loans from investors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 126,960 |  |  | $ 26,961 | $ 64,829 | $ 50,000 | $ 50,000
Amounts payable, related party transactions |  |  |  | $ 0 |  |  | $ 0 |  |  |  |  |  |  | $ 191,789 |  |  |  |

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