Employee benefits - Summary of Group's Liabilities for Employee Benefits (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Defined Benefit Plans [Line Items]
Beginning balance	€ 6,847	€ 6,612
Interest cost	118	50
Current service cost	712	531
Benefits paid	(748)	(534)
Actuarial Gains and Losses	(890)	150
Exchange rate differences	89	38
Ending balance	6,128	6,847
Recognized in the consolidated income statement	780	579
Recognized in the other comprehensive income	(841)	151
Trattamento Fine Rapporto
Disclosure Of Defined Benefit Plans [Line Items]
Beginning balance	5,895	5,791
Interest cost	55	18
Current service cost	497	402
Benefits paid	(603)	(476)
Actuarial Gains and Losses	(908)	160
Ending balance	4,936	5,895
Recognized in the consolidated income statement	551	419
Recognized in the other comprehensive income	(908)	160
Jubilee Benefits
Disclosure Of Defined Benefit Plans [Line Items]
Beginning balance	253	239
Interest cost	3	2
Current service cost	31	27
Benefits paid	(25)	(13)
Actuarial Gains and Losses	(49)	(2)
Ending balance	213	253
Recognized in the consolidated income statement	(16)	28
Beneficio por Retiro / Terminacion
Disclosure Of Defined Benefit Plans [Line Items]
Beginning balance	659	552
Interest cost	60	29
Current service cost	178	95
Benefits paid	(114)	(32)
Actuarial Gains and Losses	68	(23)
Exchange rate differences	89	38
Ending balance	940	659
Recognized in the consolidated income statement	238	123
Recognized in the other comprehensive income	68	(23)
Severance Payment Slovakia
Disclosure Of Defined Benefit Plans [Line Items]
Beginning balance	40	30
Interest cost		1
Current service cost	6	7
Benefits paid	(6)	(13)
Actuarial Gains and Losses	(1)	15
Ending balance	39	40
Recognized in the consolidated income statement	6	8
Recognized in the other comprehensive income	€ (1)	€ 15

The amount of other comprehensive income, net of tax, resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions]

Name:	ifrs-full_ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetOfTaxDefinedBenefitPlans
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of benefits paid or payable for retirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 26
-IssueDate 2022-03-24
-Paragraph 35
-Subparagraph b
-Clause v
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2022-en-r&anchor=para_35_b_v&doctype=Standard
-URIDate 2022-03-24

+ Details

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

- Definition

The expense of employee service in the current period arising from defined benefit plans. [Refer: Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase in net defined benefit liability (asset) resulting from current service cost]

+ References

+ Details

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

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2022-03-24
-Paragraph 57
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_DefinedBenefitObligationAtPresentValue
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

- Definition

The amount of interest expense arising from defined benefit plans. [Refer: Interest expense; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

+ Details

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

- Definition

The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2022-03-24
-Paragraph 135
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_135_b&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 91
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_91_a&doctype=Standard
-URIDate 2022-03-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 7
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_7&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Gains (losses) arising from exchange differences, defined benefit plans.

+ References

No definition available.

+ Details

Name:	stvn_GainsLossesArisingFromExchangeDifferencesDefinedBenefitPlans
Namespace Prefix:	stvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Service cost and interest and actuarial gains and losses.

+ References

No definition available.

+ Details

Name:	stvn_ServiceCostAndInterestAndActuarialGainsAndLosses
Namespace Prefix:	stvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=stvn_TrattamentoFineRapportoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=stvn_JubileeBenefitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=stvn_BeneficioPorRetiroTerminacionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=stvn_SeverancePaymentSlovakiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: