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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.