Document and Entity Information - shares
3 Months Ended
Apr. 30, 2016
Jun. 01, 2016
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Apr. 30, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q1  
Trading Symbol OLLI  
Entity Registrant Name Ollie's Bargain Outlet Holdings, Inc.  
Entity Central Index Key 0001639300  
Current Fiscal Year End Date --01-28  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   60,002,125