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Commitments - Summary of Future Minimum Lease Payments Payable Under Noncancellable Operating Leases (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 CAD ($)
Disclosure of maturity analysis of operating lease payments and purchase obligations [line items] |
Future Minimum Lease Payments Payable | $ 1,290.8
Variable payments and non-lease elements | (320.3)
Purchase obligations | (68.0)
Total minimum lease payments | 902.5
Within one year [member] |
Disclosure of maturity analysis of operating lease payments and purchase obligations [line items] |
Future Minimum Lease Payments Payable | 252.3
2018 to 2022 [member] |
Disclosure of maturity analysis of operating lease payments and purchase obligations [line items] |
Future Minimum Lease Payments Payable | 638.5
More than five years [member] |
Disclosure of maturity analysis of operating lease payments and purchase obligations [line items] |
Future Minimum Lease Payments Payable | $ 400.0

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- Definition The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2018-01-01 -Paragraph 35 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2018-03-02&anchor=para_35_a&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of maturity analysis of operating lease payments and purchase obligations. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Minimum lease payments payable under noncancellable operating lease and purchase obligations. + References No definition available. + Details
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Namespace Prefix: | stn_
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- Definition Purchase contractual obligation. + References No definition available. + Details
Name: | stn_PurchaseContractualObligation
Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Variable and non lease component under noncancellable operating lease. + References No definition available. + Details
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Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |