| Document And Entity Information | 12 Months Ended |
| Sep. 30, 2023 | |
| Document Information Line Items | |
| Entity Registrant Name | LEDDARTECH HOLDINGS INC. |
| Document Type | F-1/A |
| Amendment Flag | true |
| Amendment Description | LeddarTech Holdings Inc. is filing this Amendment No. 3 (this “Amendment No. 3”) to the Registration Statement on Form F-1 (Registration No. 333-277045) as an exhibit-only filing solely to file the opinion of Stikeman Elliott LLP as Exhibit 5.1 and the consent of Stikeman Elliott LLP as Exhibit 23.3 (included in Exhibit 5.1). Accordingly, this Amendment No. 3 consists only of the facing page, this explanatory note, Part II of the Registration Statement, the signature pages to the Registration Statement, and the exhibits being filed, and is not intended to amend or delete any part of the Registration Statement except as specifically noted herein. |
| Entity Central Index Key | 0001981462 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Incorporation, State or Country Code | Z4 |
| Entity Address, Address Line One | 4535, boulevard Wilfrid-Hamel |
| Entity Address, Address Line Two | Suite 240 |
| Entity Address, State or Province | QC |
| Entity Address, Postal Zip Code | G1P 2J7 |
| Entity Address, City or Town | Canada |
| City Area Code | (418) |
| Local Phone Number | 653-9000 |
| Business Contact | |
| Document Information Line Items | |
| Entity Address, Address Line One | 1209 Orange Street |
| Entity Address, State or Province | DE |
| Entity Address, Postal Zip Code | 19801 |
| Entity Address, City or Town | Wilmington |
| City Area Code | (418) |
| Local Phone Number | 653-9000 |
| Contact Personnel Name | c/o The Corporation Trust Company |
