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Realignment Costs - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
2023 Program
Postemployment Benefits [Line Items]
Realignment costs	$ 9	$ 876	$ 12,579

X

- Definition

Postemployment Benefits

+ References

No definition available.

+ Details

Name:	bsy_PostemploymentBenefitsLineItems
Namespace Prefix:	bsy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period expense related to postemployment benefits.

+ References

No definition available.

+ Details

Name:	us-gaap_PostemploymentBenefitsPeriodExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	bsy_PostemploymentBenefitsPlanAxis=bsy_A2023ProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: