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Cover Page
Sep. 01, 2021
Dec. 02, 2020
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Sep. 01, 2021  
Entity Registrant Name FIVE BELOW, INC.  
Entity Incorporation, State or Country Code PA  
Entity File Number 001-35600  
Entity Tax Identification Number 75-3000378  
Entity Address, Address Line One 701 Market Street  
Entity Address, Address Line Two Suite 300  
Entity Address, City or Town Philadelphia  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 19106  
City Area Code 215  
Local Phone Number 546-7909  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Entity Emerging Growth Company false  
Entity Central Index Key   0001177609
Amendment Flag   false