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Business Acquisitions - Additional Information (Detail) - Aggregated individually immaterial business combinations [member] $ in Millions	12 Months Ended
	Dec. 31, 2018 CAD ($)
Disclosure of detailed information about business combination [line items]
Goodwill is deductible for income tax purposes	$ 3.6
Provisions	0.8
Provision for claims outstanding	11.1
Gross revenue earned	86.0
Acquisition-related costs	$ 0.7

X

- Definition

The amount of acquisition-related costs recognised as an expense for transactions that are recognised separately from the acquisition of assets and the assumption of liabilities in business combinations. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2018-01-01
-Paragraph B64
-Subparagraph m
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_m&doctype=Appendix&seq=2
-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

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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Namespace Prefix:	ifrs-full_
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Balance Type:	na
Period Type:	duration

X

- Definition

The amount of revenue of the acquiree since the acquisition date included in the consolidated statement of comprehensive income. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2018-01-01
-Paragraph B64
-Subparagraph q
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_q_i&doctype=Appendix&seq=2
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Goodwill and intangible assets expected deductible for tax purposes.

+ References

No definition available.

+ Details

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

X

- Definition

Outstanding provisions reassessed and arised based on expected probable outcome.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Provisions for claims recognised as of acquisition date.

+ References

No definition available.

+ Details

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

X

- Details

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