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v3.25.3

Supplemental Cash Flow Information - Schedule of Non-Cash Investing Activities (Details) - CAD ($) $ in Thousands | 9 Months Ended
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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