Document and Entity Information - shares shares in Millions	6 Months Ended
	Mar. 28, 2020	May 01, 2020
Cover [Abstract]
Entity Registrant Name	BERRY GLOBAL GROUP, INC.
Entity Central Index Key	0001378992
Current Fiscal Year End Date	--09-26
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		132.5
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 28, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-35672
Entity Tax Identification Number	20-5234618
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	BERY
Security Exchange Name	NYSE