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Financial Instruments - Schedule of Telesat Financing Warrants (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 CAD ($)
Schedule of Telesat Financing Warrants [Line Items] |
Beginning balance | $ 617,135
Change in fair value | 109,780
Impact of foreign exchange | 25
Ending balance | 726,940
Government of Canada [Member] |
Schedule of Telesat Financing Warrants [Line Items] |
Beginning balance | 519,948
Change in fair value | 92,492
Impact of foreign exchange | 21
Ending balance | 612,461
Government of Quebec [Member] |
Schedule of Telesat Financing Warrants [Line Items] |
Beginning balance | 97,187
Change in fair value | 17,288
Impact of foreign exchange | 4
Ending balance | $ 114,479

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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 21 -IssueDate 2025-01-01 -Paragraph 52 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2025-en-r&anchor=para_52_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_35&doctype=Standard -URIDate 2025-03-27 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of non-current derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of change in fair value of financing warrants. + References No definition available. + Details
Name: | tsat_ChangeInFairValueOfFinancingWarrants
Namespace Prefix: | tsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
Name: | srt_CounterpartyNameAxis=tsat_GovernmentOfCanadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=tsat_GovernmentOfQuebecMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |