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Share Capital - Schedule of Number of Shares and Stated Value of the Outstanding Shares (Details)	9 Months Ended
	Sep. 30, 2025 shares
Telesat Public shares
Telesat Public shares	14,685,375
Class A Common Shares [Member]
Telesat Public shares
Telesat Public shares	3,955,135
Class B Variable Voting Shares [Member]
Telesat Public shares
Telesat Public shares	10,730,240

X

- Definition

breakdown of Telesat Public shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	tsat_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	tsat_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=tsat_ClassACommonSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=tsat_ClassBVariableVotingSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: