v3.19.3
Cover Page - shares
9 Months Ended
Sep. 28, 2019
Nov. 05, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 28, 2019  
Document Transition Report false  
Entity File Number 001-38950  
Entity Registrant Name Grocery Outlet Holding Corp.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 47-1874201  
Entity Address, Address Line One 5650 Hollis Street  
Entity Address, City or Town Emeryville  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94608  
City Area Code 510  
Local Phone Number 845-1999  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol GO  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   88,892,622
Entity Central Index Key 0001771515  
Current Fiscal Year End Date --12-28  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Amendment Flag false