Document and Entity Information - shares	9 Months Ended
	Sep. 29, 2019	Nov. 07, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 29, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	J. Alexander's Holdings, Inc.
Entity Incorporation, State or Country Code	TN
Entity Interactive Data Current	Yes
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Central Index Key	0001617227
Entity Shell Company	false
Entity File Number	1-37473
Entity Tax Identification Number	47-1608715
Entity Address, Address Line One	3401 West End Avenue
Entity Address, Address Line Two	Suite 260
Entity Address, Address Line Three	P.O. Box 24300
Entity Address, City or Town	Nashville
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37202
City Area Code	615
Local Phone Number	269-1900
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-30
Entity Filer Category	Accelerated Filer
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding		14,959,176
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	JAX
Security Exchange Name	NYSE