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Cover - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
May 14, 2021
Sep. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2021    
Current Fiscal Year End Date --03-31    
Document Transition Report false    
Entity File Number 001-37873    
Entity Registrant Name e.l.f. Beauty, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 46-4464131    
Entity Address, Address Line One 570 10th Street    
Entity Address, City or Town Oakland,    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94607    
City Area Code (510)    
Local Phone Number 778-7787    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol ELF    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 841.2
Entity Common Stock, Shares Outstanding   51,649,915  
Documents Incorporated by Reference Portions of the registrant’s Definitive Proxy Statement relating to the registrant’s 2021 annual meeting of stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K. Such Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant's fiscal year ended March 31, 2021.    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001600033    
Entity Filer Category Large Accelerated Filer