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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%

X

- 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

X

- References

No definition available.

+ Details

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

X

- Details

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