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Escrow Reserves - Summary of Escrow Reserves (Details)	Jun. 30, 2022 AUD ($)
Escrow Reserves [abstract]
Escrow reserves	$ 14,639,419

X

- Definition

Current escrow reserves.

+ References

No definition available.

+ Details

Name:	nvx_CurrentEscrowReserves
Namespace Prefix:	nvx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Escrow reserves.

+ References

No definition available.

+ Details

Name:	nvx_EscrowReservesAbstract
Namespace Prefix:	nvx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration