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Document and Entity Information
Nov. 05, 2020
Cover [Abstract]  
Entity Registrant Name POTBELLY CORP
Amendment Flag false
Entity Central Index Key 0001195734
Document Type 8-K
Document Period End Date Nov. 05, 2020
Entity Incorporation, State or Country Code DE
Entity File Number 001-36104
Entity Tax Identification Number 36-4466837
Entity Address, Address Line One 111 N. Canal Street
Entity Address, Address Line Two Suite 850
Entity Address, City or Town Chicago
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60606
City Area Code (312)
Local Phone Number 951-0600
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol PBPB
Security Exchange Name NASDAQ
Entity Emerging Growth Company false