XML 137 R119.htm IDEA: XBRL DOCUMENT v3.10.0.1

Employee Defined Benefit Obligations - Summary of Quantitative Sensitivity Analyses Impact on Defined Benefit Obligation for Significant Assumptions (Detail) - CAD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Change in discount rate by 0.25% [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase	$ (15.6)	$ (11.2)
Decrease	17.0	11.8
Change in pre-retirement inflation rate by 0.25% [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase	5.0	3.9
Decrease	(4.8)	(3.8)
Change in salary growth by 0.25% [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase	0.9	0.5
Decrease	(0.8)	(0.5)
Change in pension increase assumption by 0.25% [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase	8.4	6.4
Decrease	(8.1)	(6.1)
Increase of one year in the life expectancy [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase	$ 9.4	$ 6.0

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

Name:	ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 145
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_a&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 145
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_a&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=stn_ActuarialAssumptionOfDiscountRatesZeroPointTwoFivePercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=stn_ActuarialAssumptionOfExpectedRatesOfInflationPreRetirementZeroPointTwoFivePercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=stn_ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesZeroPointTwoFivePercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=stn_ActuarialAssumptionOfExpectedRatesOfPensionIncreasesZeroPointTwoFivePercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=stn_ActuarialAssumptionsOfExpectedIncreaseOfOneYearInLifeExpectancyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: