Fair Value of Horizen Additional Information (Detail)	Jun. 30, 2022 Horizen $ / shares	Sep. 30, 2021 Horizen $ / shares
Fair Value Disclosures [Abstract]
Investments owned balance shares held by custodian \| Horizen	620,253.26703461	615,585.26478971
Horizen fair value per share \| $ / shares	$ 12.67	$ 69.53

Investments owned balance shares held by custodian.

No definition available.

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Data Type:	xbrli:decimalItemType
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Period Type:	instant