| Cover | Oct. 31, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 31, 2021 |
| Entity File Number | 001-36568 |
| Entity Registrant Name | HEALTHEQUITY, INC. |
| Entity Central Index Key | 0001428336 |
| Entity Tax Identification Number | 52-2383166 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 15 West Scenic Pointe Drive |
| Entity Address, Address Line Two | Suite 100 |
| Entity Address, City or Town | Draper |
| Entity Address, State or Province | UT |
| Entity Address, Postal Zip Code | 84020 |
| City Area Code | 801 |
| Local Phone Number | 727-1000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.0001 per share |
| Trading Symbol | HQY |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
