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Material Accounting Policy Information - Schedule of Impact on the Balance Sheet (Details) - Orbital Slot Intangible Assets [Member] $ in Millions	Sep. 30, 2025 CAD ($)
Schedule of Impact on the Balance Sheet [Line Items]
Intangible assets	$ (25.7)
Accumulated earnings	$ 25.7

X

- Definition

The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill]

+ References

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+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

A component of equity representing the entity's cumulative undistributed earnings or deficit.

+ References

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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: