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Trade and Other Receivables - Schedule of Gross Trade Receivables Aging Analysis (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Trade and other receivables [line items] |  |
Trade receivables | $ 776.0 | $ 748.7
1-30 Days [member] |  |
Trade and other receivables [line items] |  |
Trade receivables | 355.6 | 403.1
31-60 Days [member] |  |
Trade and other receivables [line items] |  |
Trade receivables | 228.7 | 182.4
61-90 Days [member] |  |
Trade and other receivables [line items] |  |
Trade receivables | 63.8 | 53.9
91-120 Days [member] |  |
Trade and other receivables [line items] |  |
Trade receivables | 43.2 | 29.1
121+ Days [member] |  |
Trade and other receivables [line items] |  |
Trade receivables | $ 84.7 | $ 80.2

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- Definition Gross trade receivables. + References No definition available. + Details
Name: | stn_GrossTradeReceivables
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Trade and other receivables. + References No definition available. + Details
Name: | stn_TradeAndOtherReceivablesLineItems
Namespace Prefix: | stn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

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

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