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Intangible Assets - Additional Information (Details) - Software licenses - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about intangible assets [line Items] |  |
Software financing obligations | $ 5.5 | $ 16.7
Non cash portion of financial leases additions | $ 0.4 | $ 8.4

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

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- Definition Non cash portion of software additions. + References No definition available. + Details
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Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Software financing obligation. + References No definition available. + Details
Name: | stn_SoftwareFinancingObligation
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |