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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: