Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Feb. 02, 2019
Mar. 27, 2019
Aug. 03, 2018
Document and Entity Information [Abstract]      
Entity Registrant Name Ollie's Bargain Outlet Holdings, Inc.    
Entity Central Index Key 0001639300    
Current Fiscal Year End Date --02-02    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Ex Transition Period false    
Entity Public Float     $ 3.7
Entity Common Stock, Shares Outstanding   63,192,389  
Document Type 10-K    
Amendment Flag false    
Document Period End Date Feb. 02, 2019    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY