XML 142 R114.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Provisions - Additional Information (Detail) CAD in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD
Disclosure of Provisions [line items] |  |  |
Long-term portion | CAD 81.7 |  | CAD 80.7
Anticipated lease exit liability to be recorded in fourth quarter of 2018 | $ |  | $ 15.0 |
Self-insured liabilities provision [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Long-term portion | CAD 65.9 |  | CAD 64.0
Bottom of range [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Cash outflows for existing provisions expected period | 1 year |  |
Top of range [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Cash outflows for existing provisions expected period | 5 years |  |

X
- Definition The description of the expected timing of outflows of economic benefits related to other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 85 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_85_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DescriptionOfExpectedTimingOfOutflowsOtherProvisions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of non-current provisions. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_l&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NoncurrentProvisions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Disclosure of provisions line items. + References No definition available. + Details
Name: | stn_DisclosureOfProvisionsLineItems
Namespace Prefix: | stn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected Lease Exit Liability + References No definition available. + Details
Name: | stn_ExpectedLeaseExitLiability
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=stn_SelfInsuredLiabilitiesProvisionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |