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Net Interest Expense and Other Net Finance Expense - Schedule of Other Net Finance Expense (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of other net finance expense [abstract]
Amortization on available-for-sale investment debt securities	CAD 0.6	CAD 0.4
Bank charges	8.6	7.4
Total other finance expense	9.2	7.8
Realized gain on sale of available-for-sale investment debt securities	(1.4)	(0.1)
Derecognition of notes payable	(0.7)	(1.3)
Other net finance expense	CAD 7.1	CAD 6.4

X

- Definition

The amount of bank and similar charges recognised by the entity as an expense.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
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-URIDate 2017-03-09

+ Details

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Balance Type:	debit
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X

- Definition

The amount of finance costs that the entity does not separately disclose in the same statement or note. [Refer: Finance costs]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

Amortization on available for sale investment debt securities.

+ References

No definition available.

+ Details

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X

- Definition

Derecognition of notes payable.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Disclosure of other net finance expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	stn_
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X

- Definition

Other finance expense.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Other finance income on available for sale financial assets.

+ References

No definition available.

+ Details

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