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Intangible Assets - Additional Information (Details) - CAD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Software licenses
Disclosure of detailed information about intangible assets [line Items]
Software financing obligations	$ 15.4	$ 32.7

X

- 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

Name:	ifrs-full_DisclosureOfIntangibleAssetsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
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

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=stn_SoftwareLicensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: