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Intangible Assets - Additional Information (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Software licenses
Disclosure of detailed information about intangible assets [line Items]
Software financing obligations	$ 41.5	$ 15.4

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
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- Definition

Software financing obligation.

+ References

No definition available.

+ Details

Name:	stn_SoftwareFinancingObligation
Namespace Prefix:	stn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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