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Comparative Figures - Additional Information (Detail) $ in Millions | Dec. 31, 2018 CAD ($)
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Disclosure of reclassifications or changes in presentation [abstract] |
Employee defined benefit liability | $ 13.6

X
- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net employee defined benefit liability. + References No definition available. + Details
Name: | stn_NetEmployeeDefinedBenefitLiability
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant