| Cover | Jun. 03, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jun. 3, 2021 |
| Entity Registrant Name | TILLY’S, INC. |
| Entity Incorporation, State or 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 |
| Title of 12(b) Security | Class A Common Stock, $0.001 par value per share |
| Trading Symbol | TLYS |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001524025 |
