| Cover Page | Nov. 24, 2020 |
| Entity Listings [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 24, 2020 |
| Entity Registrant Name | Chico’s FAS, Inc. |
| Entity Incorporation, State or Country Code | FL |
| Entity File Number | 001-16435 |
| Entity Tax Identification Number | 59-2389435 |
| Entity Address, Address Line One | 11215 Metro Parkway |
| Entity Address, City or Town | Fort Myers |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33966 |
| City Area Code | 239 |
| Local Phone Number | 277-6200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0000897429 |
| Common Stock, Par Value $0.01 Per Share | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Common Stock, Par Value $0.01 Per Share |
| Trading Symbol | CHS |
| Security Exchange Name | NYSE |
| Series A Junior Participating Preferred Stock Purchase Rights | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Series A Junior Participating Preferred Stock Purchase Rights |
| Trading Symbol | CHS |
| Security Exchange Name | NYSE |
