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Financial Highlights - Summary of Financial Highlights (Detail) - $ / shares | 3 Months Ended | 6 Months Ended | 8 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Net Asset Value |  |  |  |  |  |  |  |
Net asset value per Share, beginning of period | $ 120.29 |  | $ 118.42 | $ 119.77 | [1],[2] | $ 118.42 | $ 118.42 |
Net investment income/(loss) | (0.15) |  | (0.10) | (0.30) |  | (0.10) | (0.41) |
Net Realized and Change in Unrealized Gain (Loss) | 0.08 |  | 5.75 | 0.75 |  | 5.75 | 1.76 |
Net Income/(Loss) | (0.07) |  | 5.65 | 0.45 |  | 5.65 | 1.35 |
Net asset value per Share, end of period | 120.22 | [1] | 124.07 | 120.22 | [1] | 124.07 | 119.77 | [1],[2]
Market value per Share, beginning of period | 120.87 |  | 119.53 | 118.89 |  | 119.53 | 119.53 |
Market value per Share, end of period | $ 120.92 |  | $ 124.39 | $ 120.92 |  | $ 124.39 | $ 118.89 |
Ratio to average net assets |  |  |  |  |  |  |  |
Net Investment loss | (0.50%) |  | (0.50%) | (0.50%) |  | (0.50%) | (0.50%) |
Gross expenses | 0.50% |  | 0.50% | 0.50% |  | 0.50% | 0.50% |
Net expenses | 0.50% |  | 0.50% | 0.50% |  | 0.50% | 0.50% |
Total Return, at net asset value | (0.06%) |  | 4.77% | 0.38% |  | 4.77% | 1.14% |
Total Return, at market value | 0.04% |  | 4.07% | 1.71% |  | 4.07% | (0.54%) |
SPDR Long Dollar Gold Trust [Member] |  |  |  |  |  |  |  |
Net Asset Value |  |  |  |  |  |  |  |
Net asset value per Share, beginning of period | $ 120.29 |  | $ 118.42 | $ 119.77 | [1],[2] | $ 118.42 | $ 118.42 |
Net investment income/(loss) | (0.15) |  | (0.10) | (0.30) |  | (0.10) | (0.41) |
Net Realized and Change in Unrealized Gain (Loss) | 0.08 |  | 5.75 | 0.75 |  | 5.75 | 1.76 |
Net Income/(Loss) | (0.07) |  | 5.65 | 0.45 |  | 5.65 | 1.35 |
Net asset value per Share, end of period | 120.22 | [1] | 124.07 | 120.22 | [1] | 124.07 | 119.77 | [1],[2]
Market value per Share, beginning of period | 120.87 |  | 119.53 | 118.89 |  | 119.53 | 119.53 |
Market value per Share, end of period | $ 120.92 |  | $ 124.39 | $ 120.92 |  | $ 124.39 | $ 118.89 |
Ratio to average net assets |  |  |  |  |  |  |  |
Net Investment loss | (0.50%) |  | (0.50%) | (0.50%) |  | (0.50%) | (0.50%) |
Gross expenses | 0.50% |  | 0.50% | 0.50% |  | 0.50% | 0.50% |
Net expenses | 0.50% |  | 0.50% | 0.50% |  | 0.50% | 0.50% |
Total Return, at net asset value | (0.06%) |  | 4.77% | 0.38% |  | 4.77% | 1.14% |
Total Return, at market value | 0.04% |  | 4.07% | 1.71% |  | 4.07% | (0.54%) |
[1] | Authorized share capital is unlimited and the par value of the Shares is $0.00.
[2] | No comparative has been provided as operations commenced on January 27, 2017. See Note 1.

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