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Lease Assets - Schedule of Amounts Recognized in Administrative and Marketing Expenses (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Lease [Abstract] |  |
Rent expense - variable lease payments | $ 52.0 | $ 47.5
Rent expense - short-term leases and leases of low-value assets | 4.0 | 2.9
Income from subleases | (3.5) | (2.9)
Total | $ 52.5 | $ 47.5

X
- Definition The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_e&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of income from subleasing right-of-use assets. Sublease is a transaction for which an underlying asset is re-leased by a lessee (‘intermediate lessor’) to a third party, and the lease (‘head lease’) between the head lessor and lessee remains in effect. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_f&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncomeFromSubleasingRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Expense relating to short-term leases and leases of low-value assets for which recognition exemption has been used + References No definition available. + Details
Name: | stn_ExpenseRelatingToShortTermLeasesAndLeasesOfLowValueAssetsForWhichRecognitionExemptionHasBeenUsed
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Total Expense Relating To Lease Payments Not Included In Measurement Of Lease Liabilities. + References No definition available. + Details
Name: | stn_TotalExpenseRelatingToLeasePaymentsNotIncludedInMeasurementOfLeaseLiabilities
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration