COVER PAGE - shares	4 Months Ended
	Jan. 21, 2024	Feb. 15, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jan. 21, 2024
Document Transition Report	false
Entity File Number	1-9390
Entity Registrant Name	JACK IN THE BOX INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-2698708
Entity Address, Address Line One	9357 Spectrum Center Blvd.
Entity Address, City or Town	San Diego
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92123
City Area Code	858
Local Phone Number	571-2121
Title of 12(b) Security	Common Stock
Trading Symbol	JACK
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		19,536,206
Entity Central Index Key	0000807882
Current Fiscal Year End Date	--09-29
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false