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Financial Highlights - Summary of Financial Highlights (Detail) - $ / shares
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Net Asset Value    
Net asset value per Share, beginning of period $ 124.07 $ 118.42
Net investment income/(loss) (0.15) (0.26)
Net Realized and Change in Unrealized Gain (Loss) (5.33) 0.43
Net Income/(Loss) (5.48) 0.17
Net asset value per Share, end of period [1] 118.59 118.59
Market value per Share, beginning of period 124.39 119.53
Market value per Share, end of period $ 117.43 $ 117.43
Ratio to average net assets    
Net Investment income/(loss) (0.50%) (0.50%)
Gross expenses (0.50%) (0.50%)
Net expenses (0.50%) (0.50%)
Total Return, at net asset value (4.42%) 0.14%
Total Return, at market value (5.60%) (1.76%)
SPDR Long Dollar Gold Trust [Member]    
Net Asset Value    
Net asset value per Share, beginning of period $ 124.07 $ 118.42
Net investment income/(loss) (0.15) (0.26)
Net Realized and Change in Unrealized Gain (Loss) (5.33) 0.43
Net Income/(Loss) (5.48) 0.17
Net asset value per Share, end of period [1] 118.59 118.59
Market value per Share, beginning of period 124.39 119.53
Market value per Share, end of period $ 117.43 $ 117.43
Ratio to average net assets    
Net Investment income/(loss) (0.50%) (0.50%)
Gross expenses (0.50%) (0.50%)
Net expenses (0.50%) (0.50%)
Total Return, at net asset value (4.42%) 0.14%
Total Return, at market value (5.60%) (1.76%)
[1] No comparative has been provided as operations commenced on January 27, 2017. See Note 1.