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Equity Awards and Instruments - ESPP (Details) | 12 Months Ended
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Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percent discount from market price, offering date | 85.00%
Percent discount from market price, purchase date | 85.00%
Measurement Input, Call Option Term |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
ESPP purchase right measurement input | 6 months
Measurement Input, Put Option Term |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
ESPP purchase right measurement input | 6 months

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- Definition ESPP Purchase Right Measurement Input + References No definition available. + Details
Name: | bsy_ESPPPurchaseRightMeasurementInput
Namespace Prefix: | bsy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Discount rate from fair value on offering date that participants pay for shares. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Discount rate from fair value on purchase date that participants pay for shares. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |