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Investment Tax Credit (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Investment tax credits [Abstract]
Investment tax credits	$ 10.5	$ 11.5

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- Definition

Investment tax credits

+ References

No definition available.

+ Details

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Namespace Prefix:	stn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Investment tax credits

+ References

No definition available.

+ Details

Name:	stn_InvestmentTaxCreditsAbstract
Namespace Prefix:	stn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration