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Creations and Redemptions of Shares Additional Information (Detail) - Unit	Jun. 30, 2022	Sep. 30, 2021
Equity [Abstract]
Share represented as ZEN	0.0907	0.0924

X

- Definition

Common share equivalent of ZEN.

+ References

No definition available.

+ Details

Name:	hzen_Commonshareequivalentofzen
Namespace Prefix:	hzen_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration