Document and Entity Information - shares
9 Months Ended
Nov. 02, 2019
Dec. 09, 2019
Cover [Abstract]    
Entity Registrant Name Ollie’s Bargain Outlet Holdings, Inc.  
Entity Central Index Key 0001639300  
Current Fiscal Year End Date --02-01  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   63,662,086
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Nov. 02, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 001-37501  
Entity Tax Identification Number 80-0848819  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 6295 Allentown Boulevard  
Entity Address, Address Line Two Suite 1  
Entity Address, City or Town Harrisburg  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 17112  
City Area Code 717  
Local Phone Number 657-2300  
Title of 12(b) Security Common Stock, $0.001 par value  
Trading Symbol OLLI  
Security Exchange Name NASDAQ