XML 104 R77.htm IDEA: XBRL DOCUMENT v3.10.0.1

Recent Accounting Pronouncements and Changes to Accounting Policies - Schedule of Impact of Changes to Accounting Policies on Retained Earnings (Detail) - Retained earnings [member] - Increase (decrease) due to application of IFRS 15 [member] $ in Millions	Jan. 01, 2018 CAD ($)
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Total impact of change in accounting policy	$ (23.9)
Continuing operations [member] | Change Orders and Claims [Member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Total impact of change in accounting policy	(3.0)
Continuing operations [member] | Significant Financing Component [Member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Total impact of change in accounting policy	1.7
Discontinued operations [member] | Construction Services [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Total impact of change in accounting policy	$ (22.6)

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

X

- Definition

Increase (Decrease) in Retained Earnings.

+ References

No definition available.

+ Details

Name:	stn_IncreaseDecreaseInRetainedEarnings
Namespace Prefix:	stn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=ifrs-full_RetainedEarningsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis=ifrs-full_IncreaseDecreaseDueToApplicationOfIFRS15Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ContinuingAndDiscontinuedOperationsAxis=stn_ContinuingOperationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RestatementAxis=stn_ChangeOrdersAndClaimsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RestatementAxis=stn_SignificantFinancingComponentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ContinuingAndDiscontinuedOperationsAxis=ifrs-full_DiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentConsolidationItemsAxis=stn_ConstructionServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: