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v3.25.3

Non-Controlling Interest (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Non-Controlling Interest [Line Items] |  |
Economic interest rate | 71.00% | 72.00%
Non-controlling interests [Member] |  |
Non-Controlling Interest [Line Items] |  |
Economic interest rate | 29.00% | 28.00%

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- Definition The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Total for all subsidiaries [member]; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2025-01-01 -Paragraph 12 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_12_c&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | tsat_NonControllingInterestLineItems
Namespace Prefix: | tsat_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_NoncontrollingInterestsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |