| Document And Entity Information | Apr. 09, 2021 |
| Document Information [Line Items] | |
| Entity, Registrant Name | BJ’S WHOLESALE CLUB HOLDINGS, INC. |
| Document, Type | 8-K |
| Document, Period End Date | Apr. 9, 2021 |
| 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 |
| Trading Symbol | BJ |
| Security Exchange Name | NYSE |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001531152 |
