Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Feb. 03, 2018	Feb. 26, 2018	Jul. 29, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	CHICOS FAS INC
Entity Central Index Key	0000897429
Current Fiscal Year End Date	--02-03
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Feb. 03, 2018
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		127,468,432
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 1,142