| Document and Entity Information | Apr. 13, 2021 |
| Document and Entity Information | |
| Document Type | 8-K |
| Document Period End Date | Apr. 13, 2021 |
| 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 Parkway |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.0001 par value |
| Trading Symbol | BOOT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001610250 |
| Amendment Flag | false |
