Cover - USD ($)	12 Months Ended
	Feb. 01, 2020	Mar. 18, 2020	Aug. 03, 2018
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Feb. 01, 2020
Current Fiscal Year End Date	--02-01
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)		55,603,036
Entity Public Float			$ 5,205,255,158
Documents Incorporated by Reference	Portions of the registrant's Proxy Statement for the 2020 Annual Meeting of Shareholders to be held on June 16, 2020 (hereinafter referred to as the “Proxy Statement”) are incorporated by reference into Part III of this report.
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Central Index Key	0001177609