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Commitments - Additional Information (Detail) - CAD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Commitments [abstract]
Future minimum sublease payments expected to be received under noncancellable sublease agreements	$ 14.5	$ 19.2
Sublease receivables	$ 3.6	$ 0.0

X

- 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 2019-01-01
-Paragraph 94
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_94&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_UndiscountedFinanceLeasePaymentsToBeReceived
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Commitments [abstract]

+ References

No definition available.

+ Details

Name:	stn_CommitmentsAbstract
Namespace Prefix:	stn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Undiscounted finance and operating Llease payments to be received.

+ References

No definition available.

+ Details

Name:	stn_UndiscountedFinanceAndOperatingLeasePaymentsToBeReceived
Namespace Prefix:	stn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant