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Cover Page - USD ($) $ in Millions	12 Months Ended
Cover Page - USD ($) $ in Millions	Jan. 30, 2021	Feb. 22, 2021	Aug. 01, 2020
Entity Listings [Line Items]
Document Type	10-K
Document Quarterly Report	true
Document Period End Date	Jan. 30, 2021
Document Transition Report	false
Entity File Number	001-16435
Entity Registrant Name	Chico’s FAS, Inc.
Entity Incorporation, State or Country Code	FL
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
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 149
Entity Common Stock, Shares Outstanding		119,704,679
Documents Incorporated by Reference	Documents incorporated by reference: Portions of the Definitive Proxy Statement for the Company’s Annual Meeting of Shareholders presently scheduled for June 24, 2021 (the “2021 Annual Meeting Proxy Statement”) are incorporated by reference into Part III of this Annual Report on Form 10-K.
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--01-30
Entity Central Index Key	0000897429
Document Fiscal Year Focus	2020
Amendment Flag	false
Common Stock
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, Par Value $0.01 Per Share
Trading Symbol	CHS
Security Exchange Name	NYSE
Preferred Stock
Entity Listings [Line Items]
Title of 12(b) Security	Series A Junior Participating Preferred Stock Purchase Rights
No Trading Symbol Flag	true