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Significant Accounting Policies - Additional Information (Detail)		3 Months Ended		12 Months Ended
		Dec. 31, 2017 USD ($) T shares		Sep. 30, 2017 USD ($) T
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
Minimum denomination of shares issued redeemed against gold | shares		10,000
Net realized and change in unrealized gain/(loss) on investment in gold and Gold Delivery Agreement	[1]	$ 81,000
Net realized gain/(loss) from investment in gold sold to pay expenses		1,000	[1]	$ 3,000
Net realized gain/(loss) from Gold Delivery Agreement		(118,000)	[1]	(1,833,000)
Net realized gain/(loss) on gold transferred to cover Gold Delivery Agreement and Gold Delivery Provider fees		61,000	[1]	270,000
Net change in unrealized appreciation/(depreciation) on investment in gold		137,000	[1]	814,000
Reserve for uncertain tax positions		$ 0
Euro [Member] | Solactive GLD Long USD Gold Index [Member]
Significant Accounting Policies [Line Items]
Percentage of currency weightage		57.60%
Japanese Yen [Member] | Solactive GLD Long USD Gold Index [Member]
Significant Accounting Policies [Line Items]
Percentage of currency weightage		13.60%
British Pound Sterling [Member] | Solactive GLD Long USD Gold Index [Member]
Significant Accounting Policies [Line Items]
Percentage of currency weightage		11.90%
Canadian Dollar [Member] | Solactive GLD Long USD Gold Index [Member]
Significant Accounting Policies [Line Items]
Percentage of currency weightage		9.10%
Swedish Krona [Member] | Solactive GLD Long USD Gold Index [Member]
Significant Accounting Policies [Line Items]
Percentage of currency weightage		4.20%
Swiss Franc [Member] | Solactive GLD Long USD Gold Index [Member]
Significant Accounting Policies [Line Items]
Percentage of currency weightage		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
Minimum denomination of shares issued redeemed against gold | shares		10,000
Net realized and change in unrealized gain/(loss) on investment in gold and Gold Delivery Agreement	[1]	$ 81,000
Net realized gain/(loss) from investment in gold sold to pay expenses		1,000	[1]	3,000
Net realized gain/(loss) from Gold Delivery Agreement		(118,000)	[1]	(1,833,000)
Net realized gain/(loss) on gold transferred to cover Gold Delivery Agreement and Gold Delivery Provider fees		61,000	[1]	270,000
Net change in unrealized appreciation/(depreciation) on investment in gold		137,000	[1]	$ 814,000
Reserve for uncertain tax positions		$ 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%
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%
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%
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%
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%
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%
[1] No comparative has been provided as operations commenced on January 27, 2017. See Note 1.

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Fair value assets and liabilities transfers between level one level two and level three.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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