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Financial Instruments - Schedule of Telesat Financing Warrants (Details) $ in Thousands	9 Months Ended
	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

X

- 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

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

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Balance Type:	credit
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X

- Definition

Amount of change in fair value of financing warrants.

+ References

No definition available.

+ Details

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Namespace Prefix:	tsat_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	tsat_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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