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Cover Page - shares
 3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Oct. 29, 2021
Cover [Abstract]      
Document Type   10-Q  
Document Quarterly Report true    
Document Period End Date   Sep. 30, 2021  
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, par value $0.01 per share  
Trading Symbol   ELF  
Security Exchange Name   NYSE  
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     52,031,436
Amendment Flag   false  
Document Fiscal Year Focus   2022  
Document Fiscal Period Focus   Q2  
Entity Central Index Key   0001600033  
Current Fiscal Year End Date   --03-31