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Segment Information (Details)	9 Months Ended
	Sep. 30, 2025 Segments
Segment Information [Abstract]
Operating segments	2

X

- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfOperatingSegmentsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of operating segment.

+ References

No definition available.

+ Details

Name:	tsat_NumberOfOperatingsSegment
Namespace Prefix:	tsat_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration