| Cover Cover | Aug. 20, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 20, 2020 |
| Entity Registrant Name | BJ’S WHOLESALE CLUB HOLDINGS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-38559 |
| Entity Tax Identification Number | 45-2936287 |
| Entity Address, Address Line One | 25 Research Drive, |
| Entity Address, City or Town | Westborough, |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01581 |
| City Area Code | (774) |
| Local Phone Number | 512-7400 |
| 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 |
| Trading Symbol | BJ |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001531152 |
| Amendment Flag | false |
