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Derivative Contract Information - Fund's OTC Derivative Liabilities (Detail) - Merrill Lynch International [Member] - Over-the-Counter ("OTC") [Member] - USD ($) | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Liabilities Presented in the Statement of Financial Condition | $ 0 | $ 0
Financial Instruments Available for Offset | 0 | 0
Financial Instruments Collateral Pledged | 0 | 0
Cash Collateral Pledged | 0 | 0
Net Amount | 0 | 0
SPDR Long Dollar Gold Trust [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Liabilities Presented in the Statement of Financial Condition | 0 | 0
Financial Instruments Available for Offset | 0 | 0
Financial Instruments Collateral Pledged | 0 | 0
Cash Collateral Pledged | 0 | 0
Net Amount | $ 0 | $ 0

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