| Document And Entity Information - shares | 12 Months Ended | |
| Sep. 30, 2023 | Dec. 21, 2023 |
| Document Information Line Items | | |
| Entity Registrant Name | LEDDARTECH
HOLDINGS INC. | |
| Document Type | 20-F | |
| Current Fiscal Year End Date | --09-30 | |
| Entity Common Stock, Shares Outstanding | | 28,770,982 |
| Amendment Flag | false | |
| Entity Central Index Key | 0001981462 | |
| Entity Current Reporting Status | No | |
| Entity Voluntary Filers | No | |
| Entity Filer Category | Non-accelerated Filer | |
| Entity Well-known Seasoned Issuer | No | |
| Document Period End Date | Sep. 30, 2023 | |
| Document Fiscal Year Focus | 2023 | |
| Document Fiscal Period Focus | FY | |
| Entity Emerging Growth Company | true | |
| Entity Shell Company | false | |
| Entity Ex Transition Period | false | |
| ICFR Auditor Attestation Flag | false | |
| Document Registration Statement | false | |
| Document Annual Report | false | |
| Document Transition Report | false | |
| Document Shell Company Report | true | |
| Document Shell Company Event Date | Dec. 21, 2023 | |
| Entity Incorporation, State or Country Code | A8 | |
| Entity Address, Address Line One | 4535, boulevard Wilfrid-Hamel | |
| Entity Address, Address Line Two | Suite 240 | |
| Entity Address, City or Town | Quebec | |
| Entity Address, State or Province | QC | |
| Entity Address, Postal Zip Code | G1P 2J7 | |
| Entity Address, Country | CA | |
| Entity Interactive Data Current | Yes | |
| Document Financial Statement Error Correction [Flag] | false | |
| Document Accounting Standard | International Financial Reporting Standards | |
| Auditor Name | Ernst & Young LLP | |
| Auditor Location | Canada | |
| Auditor Firm ID | 1263 | |
| Entity File Number | 000-00000 | |
| Business Contact | | |
| Document Information Line Items | | |
| Entity Address, Address Line One | 4535,
boulevard Wilfrid-Hamel | |
| Entity Address, Address Line Two | Suite 240 | |
| Entity Address, City or Town | Quebec | |
| Entity Address, State or Province | QC | |
| Entity Address, Postal Zip Code | G1P 2J7 | |
| Entity Address, Country | CA | |
| City Area Code | (514) | |
| Local Phone Number | 605-6574 | |
| Contact Personnel Name | david | |
| Contact Personnel Email Address | david.torralbo@leddartech.com | |
| Common shares, without par value | | |
| Document Information Line Items | | |
| Trading Symbol | LDTC | |
| Title of 12(b) Security | Common shares, without par value | |
| Security Exchange Name | NASDAQ | |
| Warrants to purchase common shares | | |
| Document Information Line Items | | |
| Trading Symbol | LDTCW | |
| Title of 12(b) Security | Warrants to purchase common shares | |
| Security Exchange Name | NASDAQ | |
