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Supplemental Cash Flow Information - Schedule of Income Taxes Paid, Net of Income Taxes Received (Details) - CAD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Income Taxes [Abstract] |  |
Income taxes paid | $ (10,720) | $ (48,644)
Income taxes received | 18,984 | 8,094
Income taxes paid, net of income tax received | $ 8,264 | $ (40,550)

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- Definition The cash flows from income taxes paid or refunded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2025-01-01 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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- Definition Income taxes paid. + References No definition available. + Details
Name: | tsat_IncomeTaxePaid
Namespace Prefix: | tsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Income taxes received. + References No definition available. + Details
Name: | tsat_IncomeTaxesReceived
Namespace Prefix: | tsat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration