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v3.22.4

Significant accounting policies - Schedule of estimated useful lives for KWESST's property and equipment (Details) | 9 Months Ended | 12 Months Ended
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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

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- Definition Description of useful life used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2022-03-24 -Paragraph 73 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_73_c&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_DescriptionOfUsefulLifePropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2022-03-24 -Paragraph 73 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_73_c&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ComputerEquipmentMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ComputerSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=kwe_LowRateInitialProductionEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=kwe_ResearchAndDevelopmentEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=kwe_SalesDemoEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |