Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Mar. 28, 2020	May 19, 2020	Sep. 28, 2019
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Mar. 28, 2020
Entity File Number	001-36711
Entity Registrant Name	BOOT BARN HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	90-0776290
Entity Address, Address Line One	15345 Barranca Pkwy
Entity Address, City or Town	Irvine
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92618
City Area Code	949
Local Phone Number	453-4400
Title of 12(b) Security	Common Stock, $0.0001 par value
Trading Symbol	BOOT
Security Exchange Name	NYSE
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		28,809,620
Entity Public Float			$ 838.7
Current Fiscal Year End Date	--03-28
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0001610250
Amendment Flag	false