Document and Entity Information - shares	3 Months Ended
	May 02, 2020	Jun. 09, 2020
Cover [Abstract]
Document Type	10-Q
Entity Registrant Name	Five Below, Inc.
Document Period End Date	May 02, 2020
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-35600
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
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Title of 12(b) Security	Common stock
Trading Symbol	FIVE
Security Exchange Name	NASDAQ
Entity Central Index Key	0001177609
Current Fiscal Year End Date	--01-30
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Entity Address, Postal Zip Code	19106
City Area Code	215
Local Phone Number	546-7909
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		55,755,961