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

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 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

X

- Definition

Leases

+ References

No definition available.

+ Details

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

X

- 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