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Fair Value of Financial Instruments - Narrative (Details) - Level 2 - Convertible Debt - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
2026 Notes:
Derivative [Line Items]
Long-term debt, fair value	$ 622,431	$ 720,284
2027 Notes:
Derivative [Line Items]
Long-term debt, fair value	$ 470,856	$ 531,915

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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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Balance Type:	na
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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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- Details

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X

- Details

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X

- Details

Name:	us-gaap_DebtInstrumentAxis=bsy_TwoThousandTwentySevenNotesMember
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