| Document and Entity Information | Nov. 18, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | TILLY'S, INC. |
| Amendment Flag | false |
| Entity Central Index Key | 0001524025 |
| Document Type | 8-K |
| Document Period End Date | Nov. 18, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 1-35535 |
| Entity Tax Identification Number | 45-2164791 |
| Entity Address, Address Line One | 10 Whatney |
| Entity Address, City or Town | Irvine |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92618 |
| City Area Code | (949) |
| Local Phone Number | 609-5599 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, $0.001 par value per share |
| Trading Symbol | TLYS |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
