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Significant accounting policies - Schedule of estimated useful lives for KWESST's property and equipment (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2022
Computer equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated useful lives 5 years 3 years
Computer software [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated useful lives 3 years 3 years
Office furniture and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated useful lives 5 years 5 years
Low-rate initial production equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated useful lives   5 years
R&D equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated useful lives 5 years 5 years
Sales demo equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated useful lives   2 years
Leasehold improvements [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated useful lives, description Shorter of useful life or remaining term of lease Shorter of useful life or remaining term of lease