Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($)
Purchase of capped call options, tax	$ 12,871

Adjustments To Additional Paid Capital, Purchase Of Capped Call Options, Tax

No definition available.

Name:	bsy_AdjustmentsToAdditionalPaidCapitalPurchaseOfCappedCallOptionsTax
Namespace Prefix:	bsy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration