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Supplemental Cash Flow Information - Schedule of Non-Cash Investing Activities (Details) - CAD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Schedule of Non-Cash Investing Activities [Abstract]
Satellites, property and other equipment	$ 87,936	$ 120,914
Disposal of a subsidiary	$ (1,232)	$ (2,677)

X

- Definition

Represents the amount of non cash investing activities disposal of a subsidiary.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of non-cash activities related to satellites, property and other equipment.

+ References

No definition available.

+ Details

Name:	tsat_NoncashActivitiesRelatedToSatellitesPropertyAndOtherEquipment
Namespace Prefix:	tsat_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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