XML 151 R133.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Fair Value Measurements - Summary of Fair Value Hierarchy for Liabilities (Detail) - Not measured at fair value in statement of financial position but for which fair value is disclosed [Member] $ in Millions | Dec. 31, 2018 CAD ($)
--- | ---
Disclosure of fair value measurement of liabilities [line items] |
Notes payable | $ 76.9
Significant other observable inputs [member] |
Disclosure of fair value measurement of liabilities [line items] |
Notes payable | $ 76.9

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

X
- Definition Notes payable. + References No definition available. + Details
Name: | stn_NotesPayable1
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_MeasurementAxis=ifrs-full_NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level2OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |