v3.19.2
Cover Page - shares
6 Months Ended
Jun. 29, 2019
Aug. 06, 2019
Cover page.    
Entity Registrant Name Grocery Outlet Holding Corp.  
Entity Central Index Key 0001771515  
Current Fiscal Year End Date --12-28  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Document Type 10-Q  
Document Period End Date Jun. 29, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   88,355,118