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Intangible Assets (Details) - Schedule of growth rate assumptions | Dec. 31, 2021 | Dec. 31, 2020
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Geo [Member] |  |
Intangible Assets (Details) - Schedule of growth rate assumptions [Line Items] |  |
Growth rate assumptions |  |
Leo [Member] |  |
Intangible Assets (Details) - Schedule of growth rate assumptions [Line Items] |  |
Growth rate assumptions | 3.00% | 3.00%

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- Definition The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 134 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_d_iv&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 134 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_e_iv&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | tsat_RoyaltiesAxis=tsat_GeoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | tsat_RoyaltiesAxis=tsat_LeoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |