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Cover - USD ($) $ in Billions	12 Months Ended
Cover - USD ($) $ in Billions	Dec. 31, 2023	Feb. 20, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-39548
Entity Registrant Name	BENTLEY SYSTEMS, INCORPORATED
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-3936623
Entity Address, Address Line One	685 Stockton Drive
Entity Address, City or Town	Exton
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19341
City Area Code	610
Local Phone Number	458-5000
Title of 12(b) Security	Class B Common Stock, $0.01 Par Value
Trading Symbol	BSY
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 7.0
Documents Incorporated by Reference	Portions of the proxy statement for registrant’s 2024 Annual Meeting of Stockholders (the “2024 Proxy Statement”) are incorporated by reference in Part III of this Form 10‑K to the extent stated herein. The 2024 Proxy Statement will be filed within 120 days of the registrant’s fiscal year ended December 31, 2023.
Central Index Key	0001031308
Amendment Flag	false
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,537,627
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		285,788,718