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Quarterly Statements of Operations - Schedule of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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 | [1]
EXPENSES |  |  |  |  |  |  |  |  |
Sponsor fees | $ 15 | $ 16 | $ 22 | $ 13 |  | $ 30 | $ 13 |  | $ 51
Gold Delivery Provider fees | 8 | 8 | 11 | 7 |  | 15 | 7 |  | 26
Total expenses | 23 | 24 | 33 | 20 |  | 45 | 20 |  | 77
Net investment loss | (23) | (24) | (33) | (20) |  | (45) | (20) |  | (77)
Net realized and change in unrealized gain/(loss) on investment in gold and Gold Delivery Agreement |  |  |  |  |  |  |  |  |
Net realized gain/(loss) from investment in gold sold to pay Sponsor fees | 1 | 1 | 1 | 1 | [2] | 2 | 1 | [2] | 3
Net realized gain/(loss) from Gold Delivery Agreement | (415) | (520) | (1,227) | (86) | [2] | (533) | (86) | [2] | (1,833)
Net realized gain/(loss) on gold transferred to cover Gold Delivery Agreement and Gold Delivery Provider fees | 168 | 116 | 115 | 39 | [2] | 229 | 39 | [2] | 270
Net realized gain/(loss) from gold distributed for the redemption of shares | 149 | 486 |  |  |  | 149 |  |  | 486
Net change in unrealized appreciation/(depreciation) from investment in gold | 98 | 64 | (62) | 812 | [2] | 235 | 812 | [2] | 814
Net realized and change in unrealized gain/(loss) from investment in gold and Gold Delivery Agreement | 1 | 147 | (1,173) | 766 |  | 82 | 766 |  | (260)
Net income/(loss) | $ (22) | $ 123 | $ (1,206) | $ 746 | [2] | $ 37 | $ 746 | [2] | $ (337)
Net income/(loss) per share | $ (0.15) | $ 0.80 | $ (5.48) | $ 3.85 |  | $ 0.25 | $ 3.85 |  | $ (1.80)
Weighted average number of shares (in 000's) | 150 | 153 | 220 | 194 |  | 149 | 194 |  | 187
SPDR Long Dollar Gold Trust [Member] |  |  |  |  |  |  |  |  |
EXPENSES |  |  |  |  |  |  |  |  |
Sponsor fees | $ 15 | $ 16 | $ 22 | $ 13 | [2] | $ 30 | $ 13 | [2] | $ 51
Gold Delivery Provider fees | 8 | 8 | 11 | 7 | [2] | 15 | 7 | [2] | 26
Total expenses | 23 | 24 | 33 | 20 | [2] | 45 | 20 | [2] | 77
Net investment loss | (23) | (24) | (33) | (20) | [2] | (45) | (20) | [2] | (77)
Net realized and change in unrealized gain/(loss) on investment in gold and Gold Delivery Agreement |  |  |  |  |  |  |  |  |
Net realized gain/(loss) from investment in gold sold to pay Sponsor fees | 1 | 1 | 1 | 1 | [2] | 2 | 1 | [2] | 3
Net realized gain/(loss) from Gold Delivery Agreement | (415) | (520) | (1,227) | (86) | [2] | (533) | (86) | [2] | (1,833)
Net realized gain/(loss) on gold transferred to cover Gold Delivery Agreement and Gold Delivery Provider fees | 168 | 116 | 115 | 39 | [2] | 229 | 39 | [2] | 270
Net realized gain/(loss) from gold distributed for the redemption of shares | 149 | 486 |  |  |  | 149 |  |  | 486
Net change in unrealized appreciation/(depreciation) from investment in gold | 98 | 64 | (62) | 812 | [2] | 235 | 812 | [2] | 814
Net realized and change in unrealized gain/(loss) from investment in gold and Gold Delivery Agreement | 1 | 147 | (1,173) | 766 | [2] | 82 | 766 | [2] | (260)
Net income/(loss) | $ (22) | $ 123 | $ (1,206) | $ 746 | [2] | $ 37 | $ 746 | [2] | $ (337)
Net income/(loss) per share | $ (0.15) | $ 0.80 | $ (5.48) | $ 3.85 | [2] | $ 0.25 | $ 3.85 | [2] | $ (1.80)
Weighted average number of shares (in 000's) | 150 | 153 | 220 | 194 | [2] | 149 | 194 | [2] | 187
[1] | No comparative has been provided as operations commenced on January 27, 2017. See Note 1.
[2] | Fund commenced operations on January 27, 2017. See Note 1.

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