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Commitments and Contingencies (Details) - Hosted Software Solutions - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Long-term Purchase Commitment [Line Items] |  |
Long-term purchase commitment, amount | $ 44,900 | $ 158,000
Long-term purchase commitment, amount remaining | $ 128,000 |

X
- Definition Long Term Purchase Commitment, Remaining Amount Committed + References No definition available. + Details
Name: | bsy_LongTermPurchaseCommitmentRemainingAmountCommitted
Namespace Prefix: | bsy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=bsy_HostedSoftwareSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |