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Equity Awards and Instruments - Stock Options Narrative (Details) - $ / shares		12 Months Ended
	Aug. 28, 2020	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Put provision start period, number of months since exercise		6 months
Put provision end Period, number of days after start period		30 days
Call Provision Exercise Period		7 months
Dividends payable (USD per share)	$ 1.50
Stock options exercise price reduction (USD per share)	1.50
Stock options exercise price, lower limit (USD per share)	$ 0.01

X

- Definition

Call Provision Exercise Period

+ References

No definition available.

+ Details

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Namespace Prefix:	bsy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Put Provision End Period, Number Of Days After Start Period

+ References

No definition available.

+ Details

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Namespace Prefix:	bsy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Put Provision Start Period, Number Of Months Since Exercise

+ References

No definition available.

+ Details

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Namespace Prefix:	bsy_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-based Payment Arrangement, Option, Exercise Price Reduction

+ References

No definition available.

+ Details

Name:	bsy_ShareBasedPaymentArrangementOptionExercisePriceReduction
Namespace Prefix:	bsy_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Balance Type:	na
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