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Trade and Other Payables (Details) - Schedule of trade and other payables - Trade and other payables [Member] - CAD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Trade and Other Payables (Details) - Schedule of trade and other payables [Line Items] |  |  |
Trade payables |  | $ 3,456 | $ 5,393
Other payables and accrued liabilities | [1] | 51,172 | 24,698
Trade and other payables |  | $ 54,628 | $ 30,091
[1] | Other payables and accrued liabilities included payables that are not trade in nature as well as various operating and capital accruals.

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- Definition The amount recognised as of the acquisition date for trade and other payables assumed in a business combination. [Refer: Trade and other payables; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
Name: | ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of payment due to suppliers for goods and services used in the entity's business. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_TradeAndOtherPayablesToTradeSuppliers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other payables and accrued liabilities. + References No definition available. + Details
Name: | tsat_OtherPayablesAndAccruedLiabilities
Namespace Prefix: | tsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=tsat_TradeAndOtherPayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |