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Cover - USD ($)
 12 Months Ended
Jan. 28, 2023
Mar. 15, 2023
Jul. 29, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jan. 28, 2023    
Current Fiscal Year End Date --01-28    
Document Transition Report false    
Entity File Number 001-35600    
Entity Registrant Name Five Below, Inc.    
Entity Incorporation, State or Country Code PA    
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    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol FIVE    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding (in shares)   55,655,710  
Entity Public Float     $ 6,914,474,150
Documents Incorporated by Reference Portions of the registrant's Proxy Statement for the 2023 Annual Meeting of Shareholders to be held on June 13, 2023 (hereinafter referred to as the “Proxy Statement”) are incorporated by reference into Part III of this report.    
Amendment Flag false    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001177609    
ICFR Auditor Attestation Flag true