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Revenue (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 CAD ($) unit	Dec. 31, 2023 CAD ($)
Revenue From Contracts With Customers [Abstract]
Number of specialized business operating units | unit	5
Contract liabilities recognised as of acquisition date	$ 35.0	$ 7.5
Deferred revenue	$ 350.5	$ 288.0
Percentage of gross revenue	1.00%	1.00%
Revenue from performance obligations unsatisfied (or partially unsatisfied)	$ 7,823.9	$ 6,305.9
Expected revenue recognition as contracts are completed	72.00%	73.00%
Timing expected to recognize revenue as contracts are completed	18 months

X

- Definition

The amount recognised as of the acquisition date for contract liabilities assumed in a business combination. [Refer: Contract liabilities; Total for all business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 3
-IssueDate 2024-01-01
-Paragraph B64
-Subparagraph i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B
-URIDate 2024-03-27

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The percentage of the entity's revenue. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 8
-IssueDate 2024-01-01
-Paragraph 34
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_34&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
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X

- Definition

The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue from contracts with customers]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 116
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_116_b&doctype=Standard
-URIDate 2024-03-27

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 120
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_120_a&doctype=Standard
-URIDate 2024-03-27

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Number of specialized business operating units

+ References

No definition available.

+ Details

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Namespace Prefix:	stn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage that entity expects to recognise transaction price allocated to remaining performance obligations as revenue

+ References

No definition available.

+ Details

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X

- Definition

Revenue From Contracts With Customers

+ References

No definition available.

+ Details

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X

- Definition

Timing of satisfaction of performance obligations relates to typical timing of payment

+ References

No definition available.

+ Details

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