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Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
T
shares
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
T
shares
Significant Accounting Policies [Line Items]              
Fair value of assets and liabilities, amount transferred between levels         $ 0   $ 0
Gold held by subcustodian | T         0   0
Maximum number of business days within which gold is transferred from the Fund's allocated bullion account with the Custodian         2 days   2 days
Minimum denomination of shares issued redeemed against gold | shares         10,000   10,000
Net realized and change in unrealized gain/(loss) on investment in gold and Gold Delivery Agreement $ 1,000 $ 147,000 $ (1,173,000) $ 766,000 $ 82,000 $ 766,000 $ (260,000) [1]
Net realized gain/(loss) from investment in gold sold to pay expenses 1,000 1,000 1,000 1,000 [2] 2,000 1,000 [2] 3,000 [1]
Net realized gain/(loss) from Gold Delivery Agreement (415,000) (520,000) (1,227,000) (86,000) [2] (533,000) (86,000) [2] (1,833,000) [1]
Net realized gain/(loss) on gold transferred to cover Gold Delivery Agreement and Gold Delivery Provider fees 168,000 116,000 115,000 39,000 [2] 229,000 39,000 [2] 270,000 [1]
Net realized gain/(loss) from gold distributed for the redemption of shares 149,000 486,000     149,000   486,000 [1]
Net change in unrealized appreciation/(depreciation) on investment in gold 98,000 64,000 (62,000) 812,000 [2] 235,000 812,000 [2] 814,000 [1]
Reserve for uncertain tax positions 0 0     $ 0   $ 0
Euro [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         57.60%   57.60%
Japanese Yen [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         13.60%   13.60%
British Pound Sterling [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         11.90%   11.90%
Canadian Dollar [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         9.10%   9.10%
Swedish Krona [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         4.20%   4.20%
Swiss Franc [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         3.60%   3.60%
SPDR Long Dollar Gold Trust [Member]              
Significant Accounting Policies [Line Items]              
Fair value of assets and liabilities, amount transferred between levels         $ 0   $ 0
Maximum number of business days within which gold is transferred from the Fund's allocated bullion account with the Custodian         2 days   2 days
Minimum denomination of shares issued redeemed against gold | shares         10,000   10,000
Net realized and change in unrealized gain/(loss) on investment in gold and Gold Delivery Agreement 1,000 147,000 (1,173,000) 766,000 [2] $ 82,000 766,000 [2] $ (260,000) [1]
Net realized gain/(loss) from investment in gold sold to pay expenses 1,000 1,000 1,000 1,000 [2] 2,000 1,000 [2] 3,000 [1]
Net realized gain/(loss) from Gold Delivery Agreement (415,000) (520,000) (1,227,000) (86,000) [2] (533,000) (86,000) [2] (1,833,000) [1]
Net realized gain/(loss) on gold transferred to cover Gold Delivery Agreement and Gold Delivery Provider fees 168,000 116,000 115,000 39,000 [2] 229,000 39,000 [2] 270,000 [1]
Net realized gain/(loss) from gold distributed for the redemption of shares 149,000 486,000     149,000   486,000 [1]
Net change in unrealized appreciation/(depreciation) on investment in gold 98,000 64,000 $ (62,000) $ 812,000 [2] 235,000 $ 812,000 [2] 814,000 [1]
Reserve for uncertain tax positions $ 0 $ 0     $ 0   $ 0
SPDR Long Dollar Gold Trust [Member] | Euro [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         57.60%   57.60%
SPDR Long Dollar Gold Trust [Member] | Japanese Yen [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         13.60%   13.60%
SPDR Long Dollar Gold Trust [Member] | British Pound Sterling [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         11.90%   11.90%
SPDR Long Dollar Gold Trust [Member] | Canadian Dollar [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         9.10%   9.10%
SPDR Long Dollar Gold Trust [Member] | Swedish Krona [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         4.20%   4.20%
SPDR Long Dollar Gold Trust [Member] | Swiss Franc [Member] | Solactive GLD Long USD Gold Index [Member]              
Significant Accounting Policies [Line Items]              
Percentage of currency weightage         3.60%   3.60%
[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.