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Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Thousands | 12 Months Ended
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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. + Details
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Namespace Prefix: | bsy_
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: |