| Document and Entity Information | Aug. 28, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001687932 |
| Document Type | 8-K |
| Document Period End Date | Aug. 28, 2024 |
| Entity Registrant Name | J.JILL, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38026 |
| Entity Tax Identification Number | 45-1459825 |
| Entity Address, Address Line One | 4 Batterymarch Park |
| Entity Address, City or Town | Quincy |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02169 |
| City Area Code | (617) |
| Local Phone Number | 376-4300 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.01 par value |
| Trading Symbol | JILL |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
