Combined Schedules of Investments	3 Months Ended	12 Months Ended
Dec. 31, 2017 USD ($) oz	Sep. 30, 2017 USD ($) oz
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total Investments, % of Net Assets	100.72%	100.23%
Liabilities in excess of other assets, % of Net Assets	(0.72%)	(0.23%)
Net Assets, % of Net Assets	100.00%	100.00%
Total Investments, Fair Value	$ 19,385,000	$ 14,406,000
Liabilities in excess of other assets	(139,000)	(33,000)
Net Assets, Fair Value	$ 19,246,000	$ 14,373,000
Total Investments, Ounces of gold \| oz	15.0	11.2
Total Investments, Cost	$ 18,434,000	$ 13,592,000
Gold Delivery Agreement [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total Investments, % of Net Assets	0.00%	0.00%
Gold Delivery Agreement, Counter-Party	Merrill Lynch International	Merrill Lynch International
Gold Delivery Agreement, Notional Value	$ 19,385,000	$ 14,406,000
Gold Delivery Agreement, Expiration Date	Jun. 28, 2019	Jun. 28, 2019
Gold Delivery Agreement, Unrealized Appreciation/(Depreciation)	$ 0	$ 0
Investment in Gold [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total Investments, % of Net Assets	100.72%	100.23%
Total Investments, Fair Value	$ 19,385,000	$ 14,406,000
Total Investments, Ounces of gold \| oz	15.0	11.2
Total Investments, Cost	$ 18,434,000	$ 13,592,000
SPDR Long Dollar Gold Trust [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total Investments, % of Net Assets	100.72%	100.23%
Liabilities in excess of other assets, % of Net Assets	(0.72%)	(0.23%)
Net Assets, % of Net Assets	100.00%	100.00%
Total Investments, Fair Value	$ 19,385,000	$ 14,406,000
Liabilities in excess of other assets	(139,000)	(33,000)
Net Assets, Fair Value	$ 19,246,000	$ 14,373,000
Total Investments, Ounces of gold \| oz	15.0	11.2
Total Investments, Cost	$ 18,434,000	$ 13,592,000
SPDR Long Dollar Gold Trust [Member] \| Gold Delivery Agreement [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total Investments, % of Net Assets	0.00%	0.00%
Gold Delivery Agreement, Counter-Party	Merrill Lynch International	Merrill Lynch International
Gold Delivery Agreement, Notional Value	$ 19,385,000	$ 14,406,000
Gold Delivery Agreement, Expiration Date	Jun. 28, 2019	Jun. 28, 2019
Gold Delivery Agreement, Unrealized Appreciation/(Depreciation)	$ 0	$ 0
SPDR Long Dollar Gold Trust [Member] \| Investment in Gold [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total Investments, % of Net Assets	100.72%	100.23%
Total Investments, Fair Value	$ 19,385,000	$ 14,406,000
Total Investments, Ounces of gold \| oz	15.0	11.2
Total Investments, Cost	$ 18,434,000	$ 13,592,000

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Derivative Instruments Realized Appreciation Change In Unrealized Depreciation Net

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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