| Cover | May 13, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 13, 2021 |
| Entity File Number | 001-38070 |
| Entity Registrant Name | Floor & Decor Holdings, Inc. |
| Entity Central Index Key | 0001507079 |
| Entity Tax Identification Number | 27-3730271 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 2500 Windy Ridge Parkway SE |
| Entity Address, City or Town | Atlanta |
| Entity Address, State or Province | GA |
| Entity Address, Postal Zip Code | 30339 |
| City Area Code | 404 |
| Local Phone Number | 471-1634 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, $0.001 par value per share |
| Trading Symbol | FND |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
