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Organization - Additional Information (Detail) | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 27, 2017 USD ($) shares | Mar. 31, 2018 USD ($) Series shares | Sep. 30, 2017 USD ($) Series shares
Number of established separate series | Series |  | 6 | 5
Shares issued | shares | 10 | 40,000 | 220,000
Aggregate purchase price | $ | $ 1,000 | $ 0 | $ 1,000
SPDR Long Dollar Gold Trust [Member] |  |  |
Shares issued | shares | 10 | 40,000 | 220,000
Aggregate purchase price | $ | $ 1,000 | $ 0 | $ 1,000

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