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Background of the Company (Details) - Telesat Canada [Member] | 12 Months Ended
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Dec. 31, 2021
Background of the Company (Details) [Line Items] |
Percentage of economic interests | 63.00%
Public Sector Pension Investment Board [Member] |
Background of the Company (Details) [Line Items] |
Percentage of economic interests | 36.00%

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- Definition The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph 12 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_12_c&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ifrs-full_ConsolidatedStructuredEntitiesAxis=tsat_TelesatCanadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=tsat_PublicSectorPensionInvestmentBoardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |