Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	May 15, 2020	Sep. 30, 2019
Document And Entity Information [Abstract]
Document Type	10-K/A
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Interactive Data Current	Yes
Entity Registrant Name	e.l.f. Beauty, Inc.
Entity Central Index Key	0001600033
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		50,009,051
Entity Public Float			$ 635.0