Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Feb. 03, 2018
Apr. 02, 2018
Jul. 29, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name Ollie's Bargain Outlet Holdings, Inc.    
Entity Central Index Key 0001639300    
Current Fiscal Year End Date --02-03    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 2.2
Entity Common Stock, Shares Outstanding   62,203,435  
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Feb. 03, 2018