| Cover | May 11, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 11, 2022 |
| Entity Registrant Name | BENTLEY SYSTEMS, INCORPORATED |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39548 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class B common stock, par value $0.01 per share |
| Trading Symbol | BSY |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001031308 |
| Amendment Flag | false |
