Document and Entity Information - shares	6 Months Ended
	Jul. 30, 2022	Aug. 30, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Trading Symbol	JILL
Entity Registrant Name	J.Jill, Inc.
Entity Central Index Key	0001687932
Current Fiscal Year End Date	--01-28
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-38026
Entity Tax Identification Number	45-1459825
Entity Address, Address Line One	4 Batterymarch Park
Entity Address, City or Town	Quincy
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02169
City Area Code	617
Local Phone Number	376-4300
Entity Common Stock, Shares Outstanding		10,148,504
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, $0.01 par value
Security Exchange Name	NYSE
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false