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Revenue - Significant Increases (Decreases) in Contract Assets and Deferred Revenue (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 CAD ($)
Current Contract Assets [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Acquisitions	$ 0.7
Discontinued operations and disposition of subsidiaries	(15.3)
Current Contract Liabilities [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Acquisitions	7.2
Discontinued operations and disposition of subsidiaries	$ (59.3)

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Definition

The increase in contract assets resulting from business combinations. [Refer: Business combinations [member]; Contract assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 118
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118_a&doctype=Standard
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The increase in contract liabilities resulting from business combinations. [Refer: Business combinations [member]; Contract liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 118
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118_a&doctype=Standard
-URIDate 2018-03-16

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X

- Definition

Decrease through disposal financial liabilities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Decrease through dispositions contract assets.

+ References

No definition available.

+ Details

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

X

- Details

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Period Type:

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- Details

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