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Derivative Contract Information - Effect of Derivative Contracts on the Fund's Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Net realized gain/(loss) on Gold Delivery Agreement | $ (415) | $ (520) | $ (1,227) | $ (86) | [1] | $ (533) | $ (86) | [1] | $ (1,833) | [2]
SPDR Long Dollar Gold Trust [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Net realized gain/(loss) on Gold Delivery Agreement | (415) | $ (520) | $ (1,227) | (86) | [1] | (533) | (86) | [1] | (1,833) | [2]
Over-the-Counter ("OTC") [Member] | Gold Delivery Agreement [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Net realized gain/(loss) on Gold Delivery Agreement | (415) |  |  | (86) |  | (533) | (86) |  | (1,833) |
Over-the-Counter ("OTC") [Member] | SPDR Long Dollar Gold Trust [Member] | Gold Delivery Agreement [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Net realized gain/(loss) on Gold Delivery Agreement | $ (415) |  |  | $ (86) |  | $ (533) | $ (86) |  | $ (1,833) |
[1] | Fund commenced operations on January 27, 2017. See Note 1.
[2] | No comparative has been provided as operations commenced on January 27, 2017. See Note 1.

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