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Investment Tax Credit - Additional Information (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Investment tax credits [abstract]
Investment tax credits	$ 11.5	$ 7.3

X

- Definition

The amount of income recognised in relation to government grants. [Refer: Government grants]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 20
-IssueDate 2019-01-01
-Paragraph 39
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=20&code=ifrs-tx-2019-en-r&anchor=para_39_b&doctype=Standard
-URIDate 2019-03-27

+ Details

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Period Type:	duration

X

- Definition

Investment tax credits [abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	stn_
Data Type:	xbrli:stringItemType
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Period Type:	duration