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Document and Entity Information
Dec. 05, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Dec. 05, 2021
Entity Registrant Name JACK IN THE BOX INC /NEW/
Entity Incorporation, State or Country Code DE
Entity File Number 001-09390
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 92123-1516
City Area Code 619
Local Phone Number 571-2121
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 0000807882
Title of 12(b) Security Common Stock
Trading Symbol JACK
Security Exchange Name NASDAQ