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Supplemental Cash Flow Information (Details) - Schedule of non-cash investing activities - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of non-cash investing activities [Abstract] |  |  |
Satellite, property and other equipment | $ 10,406 | $ 2,963 | $ 29,234
Intangible assets |  |  | (3,263)
C-band clearing proceeds | $ (64,289) |  |

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- Definition C-band clearing proceeds. + References No definition available. + Details
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Namespace Prefix: | tsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of non-cash activities related to intangible assets. + References No definition available. + Details
Name: | tsat_NoncashActivitiesRelatedToIntangibleAssets
Namespace Prefix: | tsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- References No definition available. + Details
Name: | tsat_ScheduleOfNonCashInvestingActivitiesAbstract
Namespace Prefix: | tsat_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration