XML 154 R136.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Financial Instruments - Summary of Timing of Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Trade and other payables | $ 567.2 | $ 704.6
Long-term debt | 935.4 | 740.8
Other financial liabilities | 3.1 | 10.9
Total contractual obligations | 1,505.7 | 1,456.3
Within one year [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Trade and other payables | 567.2 | 704.6
Long-term debt | 49.1 | 198.4
Other financial liabilities | 1.1 | 1.8
Total contractual obligations | 617.4 | 904.8
Later than one year and not later than three years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 196.7 | 541.4
Other financial liabilities | 0.3 | 7.5
Total contractual obligations | 197.0 | 548.9
After 3 years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 689.6 | 1.0
Other financial liabilities | 1.7 | 1.6
Total contractual obligations | $ 691.3 | $ 2.6

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

X
- Definition The amount of contractual undiscounted cash flows in relation to non-derivative financial liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 39 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_39_a&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contractual undiscounted cash flows in relation to trade and other payables. [Refer: Trade and other payables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2019-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph IG31A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_IG31A&doctype=Implementation%20Guidance -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph B11D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_B11D&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
Name: | ifrs-full_TradeAndOtherPayablesUndiscountedCashFlows
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Long-term debt, undiscounted cash flows. + References No definition available. + Details
Name: | stn_LongTermDebtUndiscountedCashFlows
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other financial liabilities, undiscounted cash flows. + References No definition available. + Details
Name: | stn_OtherFinancialLiabilitiesUndiscountedCashFlows
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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