Cover
| Cover | Jun. 30, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 30, 2021 |
| Entity File Number | 1-38771 |
| Entity Registrant Name | Diamond S Shipping Inc. |
| Entity Central Index Key | 0001761940 |
| Entity Tax Identification Number | 94-1480128 |
| Entity Incorporation, State or Country Code | 1T |
| Entity Address, Address Line One | 33 Benedict Place |
| Entity Address, City or Town | Greenwich |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06830 |
| City Area Code | 203 |
| Local Phone Number | 413-2000 |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Shares, $0.001 par value per share |
| Trading Symbol | DSSI |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |