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Derivative Contract Information - Summary of Average Daily Notional Value of Derivative Contracts Outstanding (Detail) - Over-the-Counter ("OTC") [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gold Delivery Agreement Average notional	$ 18,106	$ 22,963
SPDR Long Dollar Gold Trust [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gold Delivery Agreement Average notional	$ 18,106	$ 22,963

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- Definition

Average daily notional value of derivative contracts outstanding during the period.

+ References

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- 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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- Details

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X

- Details

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