Document and Entity Information - shares
6 Months Ended
Jul. 30, 2016
Aug. 31, 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 Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   60,234,033
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q2  
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jul. 30, 2016