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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.

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