| Cover Cover | Jan. 22, 2025 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 22, 2025 |
| Entity Registrant Name | Smartsheet Inc. |
| Entity Incorporation, State or Country Code | WA |
| Entity File Number | 001-38464 |
| Entity Tax Identification Number | 20-2954357 |
| Entity Address, Address Line One | 500 108th Ave NE, Suite 200 |
| Entity Address, City or Town | Bellevue |
| Entity Address, State or Province | WA |
| Entity Address, Postal Zip Code | 98004 |
| City Area Code | 844 |
| Local Phone Number | 324-2360 |
| Written Communications | false |
| Soliciting Material | true |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, no par value per share |
| Trading Symbol | SMAR |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001366561 |
| Amendment Flag | false |
| Current Fiscal Year End Date | --01-31 |
