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Financial Highlights (Tables) | 6 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Sep. 30, 2017
Summary of Financial Highlights | The following presentation includes financial highlights related to investment performance and operations of a Share outstanding for the three and six-month period ended March 31, 2018 and 2017. The net investment loss and total expense ratios have been annualized. The total return at net asset value is based on the change in net asset value of a Share during the period and the total return at market value is based on the change in market value of a Share on NYSE Arca during the period. An individual investor’s return and ratios may vary based on the timing of capital transactions.
|  | Three Months Ended Mar-31, 2018 |  |  | Three Months Ended Mar-31, 2017 |  |  | Six Months Ended Mar-31, 2018 |  |  | Six Months Ended Mar-31, 2017 |
Net Asset Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset value per Share, beginning of period |  | $ | 120.29 |  |  | $ | 118.42 |  |  | $ | 119.77 |  |  | $ | 118.42 |
Net investment income/(loss) |  |  | (0.15 | ) |  |  | (0.10 | ) |  |  | (0.30 | ) |  |  | (0.10 | )
Net Realized and Change in Unrealized Gain (Loss) |  |  | 0.08 |  |  |  | 5.75 |  |  |  | 0.75 |  |  |  | 5.75 |
Net Income/(Loss) |  |  | (0.07 | ) |  |  | 5.65 |  |  |  | 0.45 |  |  |  | 5.65 |
Net asset value per Share, end of period |  | $ | 120.22 |  |  | $ | 124.07 |  |  | $ | 120.22 |  |  | $ | 124.07 |
Market value per Share, beginning of period |  | $ | 120.87 |  |  | $ | 119.53 |  |  | $ | 118.89 |  |  | $ | 119.53 |
Market value per Share, end of period |  | $ | 120.92 |  |  | $ | 124.39 |  |  | $ | 120.92 |  |  | $ | 124.39 |
Ratio to average net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Investment loss(1) |  |  | (0.50 | )% |  |  | (0.50 | )% |  |  | (0.50 | )% |  |  | (0.50 | )%
Gross expenses(1) |  |  | 0.50 | % |  |  | 0.50 | % |  |  | 0.50 | % |  |  | 0.50 | %
Net expenses(1) |  |  | 0.50 | % |  |  | 0.50 | % |  |  | 0.50 | % |  |  | 0.50 | %
Total Return, at net asset value(2) |  |  | (0.06 | )% |  |  | 4.77 | %(3) |  |  | 0.38 | % |  |  | 4.77 | %(3)
Total Return, at market value(2) |  |  | 0.04 | % |  |  | 4.07 | %(3) |  |  | 1.71 | % |  |  | 4.07 | %(3)
(1) | Percentages are annualized.
(2) | Percentages are not annualized.
(3) | Shares began publicly trading on January 30, 2017; therefore the Total Return, at net asset value and Total Return, at market value are based on the period of January 30, 2017 to March 31, 2017.
| The following presentation includes financial highlights related to investment performance and operations of a Share outstanding for the fiscal period ended September 30, 2017. The net investment loss and total expense ratios have been annualized. The total return at net asset value is based on the change in net asset value of a Share during the year and the total return at market value is based on the change in market value of a Share on NYSE Arca during the period. An individual investor’s return and ratios may vary based on the timing of capital transactions.
|  | Fiscal Period Ended Sept-30, 2017 |
Net Asset Value |  |  |  |
Net asset value per Share, beginning of period |  | $ | 118.42 |
Net investment income/(loss) |  |  | (0.41 | )
Net Realized and Change in Unrealized Gain (Loss) |  |  | 1.76 |
Net Income/(Loss) |  |  | 1.35 |
Net asset value per Share, end of period |  | $ | 119.77 |
Market value per Share, beginning of period(1) |  | $ | 119.53 |
Market value per Share, end of period |  | $ | 118.89 |
Ratio to average net assets |  |  |  |
Net Investment loss(1) |  |  | (0.50 | )%
Gross expenses(1) |  |  | 0.50 | %
Net expenses(1) |  |  | 0.50 | %
Total Return, at net asset value(2)(3) |  |  | 1.14 | %
Total Return, at market value(2)(3) |  |  | (0.54 | )%
(1) | Percentages are annualized.
(2) | Shares began publicly trading on January 30, 2017; therefore, the Total Return, at net asset value and Total Return, at market value are based on the period of January 30, 2017 to September 30, 2017.
(3) | Percentages are not annualized.
SPDR Long Dollar Gold Trust [Member] |  |
Summary of Financial Highlights | The following presentation includes financial highlights related to investment performance and operations of a Share outstanding for the three and six-month period ended March 31, 2018 and 2017. The net investment loss and total expense ratios have been annualized. The total return at net asset value is based on the change in net asset value of a Share during the period and the total return at market value is based on the change in market value of a Share on NYSE Arca during the period. An individual investor’s return and ratios may vary based on the timing of capital transactions.
|  | Three Months Ended Mar-31, 2018 |  |  | Three Months Ended Mar-31, 2017 |  |  | Six Months Ended Mar-31, 2018 |  |  | Six Months Ended Mar-31, 2017 |
Net Asset Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset value per Share, beginning of period |  | $ | 120.29 |  |  | $ | 118.42 |  |  | $ | 119.77 |  |  | $ | 118.42 |
Net investment income/(loss) |  |  | (0.15 | ) |  |  | (0.10 | ) |  |  | (0.30 | ) |  |  | (0.10 | )
Net Realized and Change in Unrealized Gain (Loss) |  |  | 0.08 |  |  |  | 5.75 |  |  |  | 0.75 |  |  |  | 5.75 |
Net Income/(Loss) |  |  | (0.07 | ) |  |  | 5.65 |  |  |  | 0.45 |  |  |  | 5.65 |
Net asset value per Share, end of period |  | $ | 120.22 |  |  | $ | 124.07 |  |  | $ | 120.22 |  |  | $ | 124.07 |
Market value per Share, beginning of period |  | $ | 120.87 |  |  | $ | 119.53 |  |  | $ | 118.89 |  |  | $ | 119.53 |
Market value per Share, end of period |  | $ | 120.92 |  |  | $ | 124.39 |  |  | $ | 120.92 |  |  | $ | 124.39 |
Ratio to average net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Investment loss(1) |  |  | (0.50 | )% |  |  | (0.50 | )% |  |  | (0.50 | )% |  |  | (0.50 | )%
Gross expenses(1) |  |  | 0.50 | % |  |  | 0.50 | % |  |  | 0.50 | % |  |  | 0.50 | %
Net expenses(1) |  |  | 0.50 | % |  |  | 0.50 | % |  |  | 0.50 | % |  |  | 0.50 | %
Total Return, at net asset value(2) |  |  | (0.06 | )% |  |  | 4.77 | %(3) |  |  | 0.38 | % |  |  | 4.77 | %(3)
Total Return, at market value(2) |  |  | 0.04 | % |  |  | 4.07 | %(3) |  |  | 1.71 | % |  |  | 4.07 | %(3)
(1) | Percentages are annualized.
(2) | Percentages are not annualized.
(3) | Shares began publicly trading on January 30, 2017; therefore the Total Return, at net asset value and Total Return, at market value are based on the period of January 30, 2017 to March 31, 2017.
| The following presentation includes financial highlights related to investment performance and operations of a Share outstanding for the fiscal period ended September 30, 2017. The net investment loss and total expense ratios have been annualized. The total return at net asset value is based on the change in net asset value of a Share during the year and the total return at market value is based on the change in market value of a Share on NYSE Arca during the period. An individual investor’s return and ratios may vary based on the timing of capital transactions.
|  | Fiscal Period Ended Sept-30, 2017 |
Net Asset Value |  |  |  |
Net asset value per Share, beginning of period |  | $ | 118.42 |
Net investment income/(loss) |  |  | (0.41 | )
Net Realized and Change in Unrealized Gain (Loss) |  |  | 1.76 |
Net Income/(Loss) |  |  | 1.35 |
Net asset value per Share, end of period |  | $ | 119.77 |
Market value per Share, beginning of period(1) |  | $ | 119.53 |
Market value per Share, end of period |  | $ | 118.89 |
Ratio to average net assets |  |  |  |
Net Investment loss(1) |  |  | (0.50 | )%
Gross expenses(1) |  |  | 0.50 | %
Net expenses(1) |  |  | 0.50 | %
Total Return, at net asset value(2)(3) |  |  | 1.14 | %
Total Return, at market value(2)(3) |  |  | (0.54 | )%
(1) | Percentages are annualized.
(2) | Shares began publicly trading on January 30, 2017; therefore, the Total Return, at net asset value and Total Return, at market value are based on the period of January 30, 2017 to September 30, 2017.
(3) | Percentages are not annualized.

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- Definition Tabular disclosure of financial highlights. Includes, but is not limited to, per share information, income and expense ratios, total return, capital commitment and fee waiver. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10177-115837 + Details
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