Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Jan. 28, 2017
Mar. 27, 2017
Jul. 30, 2016
Document and Entity Information [Abstract]      
Entity Registrant Name Ollie's Bargain Outlet Holdings, Inc.    
Entity Central Index Key 0001639300    
Current Fiscal Year End Date --01-28    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 884
Entity Common Stock, Shares Outstanding   60,882,015  
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 28, 2017