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Revenue - Significant Increases (Decreases) in Contract Assets and Deferred Revenue (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 CAD ($)
Current Contract Assets [member] |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Acquisitions | $ 0.7
Discontinued operations and disposition of subsidiaries | (15.3)
Current Contract Liabilities [member] |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Acquisitions | 7.2
Discontinued operations and disposition of subsidiaries | $ (59.3)

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- 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
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- Definition The increase in contract assets resulting from business combinations. [Refer: Business combinations [member]; Contract assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118_a&doctype=Standard -URIDate 2018-03-16 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The increase in contract liabilities resulting from business combinations. [Refer: Business combinations [member]; Contract liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118_a&doctype=Standard -URIDate 2018-03-16 + Details
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Period Type: | duration

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- Definition Decrease through disposal financial liabilities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Decrease through dispositions contract assets. + References No definition available. + Details
Name: | stn_DecreaseThroughDispositionsContractAssets
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | stn_ContractAssetsLiabilitiesAxis=stn_CurrentContractAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |