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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

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- 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

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