| Document and Entity Information | Nov. 19, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 19, 2020 |
| Entity Registrant Name | BERRY GLOBAL GROUP, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-35672 |
| Entity Tax Identification Number | 20-5234618 |
| Entity Address, Address Line One | 101 Oakley Street |
| Entity Address, City or Town | Evansville |
| Entity Address, State or Province | IN |
| Entity Address, Postal Zip Code | 47710 |
| City Area Code | 812 |
| Local Phone Number | 424-2904 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001378992 |
| Title of 12(b) Security | Common Stock, $0.01 par value per share |
| Trading Symbol | BERY |
| Security Exchange Name | NYSE |
