| Document and Entity Information | Jun. 14, 2022 |
| Cover [Abstract] | |
| Entity Registrant Name | FIVE BELOW, INC |
| Amendment Flag | false |
| Entity Central Index Key | 0001177609 |
| Current Fiscal Year End Date | --01-28 |
| Document Type | 8-K |
| Document Period End Date | Jun. 14, 2022 |
| Entity Incorporation State Country Code | PA |
| Entity File Number | 001-35600 |
| Entity Tax Identification Number | 75-3000378 |
| Entity Address, Address Line One | 701 Market Street |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | Philadelphia |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19106 |
| City Area Code | (215) |
| Local Phone Number | 546-7909 |
| Security 12b Title | Common stock |
| Trading Symbol | FIVE |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
