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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.