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Derivative Instruments - Outstanding Commodity Contracts (Details)	9 Months Ended	12 Months Ended
	Mar. 31, 2020 T lb	Jun. 30, 2019 T lb
Aluminum
Derivative [Line Items]
Derivative outstanding | T	39,489	29,342
PET resin
Derivative [Line Items]
Derivative outstanding | lb	9,166,667	0

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Nominal mass used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=amcr_CommodityContractPETResinMember
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Period Type: