Income Taxes (Details)	3 Months Ended	6 Months Ended
Mar. 28, 2020	Mar. 28, 2020
Income Taxes [Abstract]
Uncertain tax positions recognized	(2.00%)	(2.00%)
Global intangible low-taxed income provision	(2.00%)	(2.00%)

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to Global Intangible Low-taxed Income (GILTI) taxed in the United States.

No definition available.

Name:	bery_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxedInUSPercent
Namespace Prefix:	bery_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration