Name:	ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2022-03-24
-Paragraph 17
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2022-en-r&anchor=para_17_b&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_KeyManagementPersonnelCompensationPostemploymentBenefits
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2022-03-24
-Paragraph 17
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2022-en-r&anchor=para_17_e&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Key management personnel compensation expense (reversal of expense).

No definition available.

Name:	stvn_KeyManagementPersonnelCompensationExpenseReversalOfExpense
Namespace Prefix:	stvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Key management personnel compensation, fixed remuneration annual fee.

No definition available.

Name:	stvn_KeyManagementPersonnelCompensationFixedRemunerationAnnualFee
Namespace Prefix:	stvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Key management personnel compensation, fixed remuneration fringe benefits.

No definition available.

Name:	stvn_KeyManagementPersonnelCompensationFixedRemunerationFringeBenefits
Namespace Prefix:	stvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Key management personnel compensation incentive plan benefits.

No definition available.