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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Tax Disclosure [Abstract] |  |  |  |
Discrete income tax expenses (benefits) | $ 6,455 | $ 2,887 | $ (6,732) | $ (17,794)

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- Definition Discrete Income Tax Expense (Benefit) + References No definition available. + Details
Name: | bsy_DiscreteIncomeTaxExpenseBenefit
Namespace Prefix: | bsy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration