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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Discrete income tax expense (benefit)	$ (5,073)	$ (2,138)

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration