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Executive Bonus Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Compensation Related Costs [Abstract]
Cash bonuses (in percent)	20.00%
Incentive compensation	$ 31,061	$ 27,641

X

- Definition

Percentage of adjusted operating profits paid in the form of cash bonuses.

+ References

No definition available.

+ Details

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X

- Definition

Amount of incentive compensation, including cash payments and deferred compensation to plan participants, recognized under Executive Bonus Plan.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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