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Other Liabilities - Additional Information (Detail) $ in Millions	Dec. 31, 2018 CAD ($)
Liabilities [Abstract]
Liability for uncertain tax positions	$ 35.0

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- References

No definition available.

+ Details

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

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- Definition

Liability for uncertain tax positions.

+ References

No definition available.

+ Details

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