| Document and Entity Information | Dec. 08, 2020 |
| Document Document And Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 8, 2020 |
| Entity Registrant Name | BUCKLE, INC |
| Entity Incorporation, State or Country Code | NE |
| Entity File Number | 001-12951 |
| Entity Tax Identification Number | 47-0366193 |
| Entity Address, Address Line One | 2407 West 24th Street, |
| Entity Address, City or Town | Kearney, |
| Entity Address, State or Province | NE |
| Entity Address, Postal Zip Code | 68845-4915 |
| City Area Code | 308 |
| Local Phone Number | 236-8491 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | BKE |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000885245 |
| Amendment Flag | false |
