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Supplemental Cash Flow Information - Schedule of Interest Paid, Net of Interest Received (Details) - CAD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Schedule of Interest Paid, Net of Interest Received [Abstract]
Interest paid	$ (138,238)	$ (159,319)
Interest received	15,489	59,757
Interest paid, net of interest received	$ (122,749)	$ (99,562)

X

- Definition

The cash outflow for interest paid, classified as financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2025-01-01
-Paragraph 31
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_31&doctype=Standard
-URIDate 2025-03-27

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

The cash inflow from interest received, classified as operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2025-01-01
-Paragraph 31
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_31&doctype=Standard
-URIDate 2025-03-27

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Interest paid, net of interest received.

+ References

No definition available.

+ Details

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Namespace Prefix:	tsat_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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