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Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Follow-On Offering
Expenses associated with sale of stock	$ 12,898

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- Definition

Stock Issuance Costs

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=bsy_FollowOnOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: