| Cover Page | May 13, 2021 | Nov. 24, 2020 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | May 13, 2021 | |
| Entity Registrant Name | DOLLAR TREE, INC. | |
| Entity Incorporation, State or Country Code | VA | |
| Entity File Number | 0-25464 | |
| Entity Tax Identification Number | 26-2018846 | |
| Entity Central Index Key | 0000935703 | |
| Amendment Flag | false | |
| Entity Address, Address Line One | 500 Volvo Parkway | |
| Entity Address, City or Town | Chesapeake, | |
| Entity Address, State or Province | VA | |
| Entity Address, Postal Zip Code | 23320 | |
| City Area Code | 757 | |
| Local Phone Number | 321-5000 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Common Stock, par value $.01 per share | |
| Trading Symbol | DLTR | |
| Security Exchange Name | NASDAQ | |
| Entity Emerging Growth Company | false |
