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v3.20.4

Commitments - Additional Information (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Leases [Abstract] |  |
Future minimum payments receivable under non-cancelable sublease agreements | $ 7.9 | $ 14.5
Sublease receivables | $ 2.1 | $ 3.6

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- Definition The amount of undiscounted finance lease payments to be received. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 94 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_94&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_UndiscountedFinanceLeasePaymentsToBeReceived
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Leases + References No definition available. + Details
Name: | stn_LeasesAbstract
Namespace Prefix: | stn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Undiscounted lease payments to be received + References No definition available. + Details
Name: | stn_UndiscountedLeasePaymentsToBeReceived
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant