| Cover Page | Nov. 04, 2021 | Oct. 27, 2020 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Nov. 4, 2021 | |
| Entity Registrant Name | Floor & Decor Holdings, Inc. | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-38070 | |
| Entity Tax Identification Number | 27-3730271 | |
| 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 | |
| Entity Information, Former Legal or Registered Name | Not Applicable | |
| 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 | |
| Amendment Flag | false | |
| Entity Central Index Key | 0001507079 |
