XML 172 R144.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Income Taxes - Schedule of Loss Carryforwards (Detail) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deductible temporary differences | CAD 12.8 | CAD 8.8
Non-capital tax losses [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital tax losses | 88.5 | 90.8
Non-capital tax losses [member] | Expire (2018 to 2037) [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital tax losses | 16.3 | 36.8
Non-capital tax losses [member] | Never expire [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital tax losses | 72.2 | 54.0
Capital tax loss [member] | Never expire [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital tax losses | 5.5 | 10.3
Non-capital and capital tax losses [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital tax losses | CAD 106.8 | CAD 109.9

X
- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=stn_NonCapitalTaxLossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=stn_Expiry2018To2037Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=stn_NeverExpireMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=stn_CapitalTaxLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=ifrs-full_TemporaryDifferenceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |