| Document and Entity Information | Nov. 15, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001810806 |
| Document Type | 8-K |
| Document Period End Date | Nov. 15, 2021 |
| Entity Registrant Name | UNITY SOFTWARE INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39497 |
| Entity Tax Identification Number | 27-0334803 |
| Entity Address, Address Line One | 30 3rd Street |
| Entity Address, City or Town | San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94103-3104 |
| City Area Code | (415) |
| Local Phone Number | 539-3162 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.000005 par value per share |
| Trading Symbol | U |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
