| Cover | Dec. 01, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | This Amendment No. 1 is being filed by B&G Foods to amend the Current Report on Form 8-K originally filed by B&G Foods with the Securities and Exchange Commission (the SEC) on December 1, 2020 to provide the information required by Item 9.01(a) and (b) of Form 8-K relating to B&G Foods' acquisition of the Crisco oils and shortening business from The J.M. Smucker Company and certain of its affiliates. In this amendment, we refer to this acquisition as the Crisco acquisition and the Crisco oils and shortening business as the Crisco business. The information previously reported and the exhibits previously filed or furnished in Items 2.01, 7.01 and 9.01(d) of the original filing are incorporated by reference into this amendment. |
| Document Period End Date | Dec. 1, 2020 |
| Entity File Number | 001-32316 |
| Entity Registrant Name | B&G Foods, Inc. |
| Entity Central Index Key | 0001278027 |
| Entity Tax Identification Number | 13-3918742 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | Four Gatehall Drive |
| Entity Address, City or Town | Parsippany |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 07054 |
| City Area Code | 973 |
| Local Phone Number | 401-6500 |
| 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 | BGS |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
