| Document and Entity Information | Aug. 27, 2020 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 27, 2020 |
| Entity File Number | 001-33764 |
| Entity Registrant Name | ULTA BEAUTY, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 38-4022268 |
| Entity Address, Address Line One | 1000 Remington Blvd. |
| Entity Address, Adress Line Two | Suite 120 |
| Entity Address, State or Province | IL |
| Entity Address, City or Town | Bolingbrook |
| Entity Address, Postal Zip Code | 60440 |
| City Area Code | 630 |
| Local Phone Number | 410-4800 |
| 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 $0.01 per share |
| Trading Symbol | ULTA |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001403568 |
| Amendment Flag | false |
