| Document and Entity Information | Sep. 28, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 28, 2021 |
| Entity Registrant Name | J. Alexander's Holdings, Inc. |
| Entity Incorporation, State or Country Code | TN |
| Entity File Number | 001-37473 |
| Entity Tax Identification Number | 47-1608715 |
| Entity Address, Address Line One | 3401 West End Avenue |
| Entity Address, Address Line Two | Suite 260, 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001617227 |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | JAX |
| Security Exchange Name | NYSE |
