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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

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

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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: |