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Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Jun. 30, 2017 USD ($)		Jun. 30, 2017 USD ($) shares
Significant Accounting Policies [Line Items]
Fair value of assets and liabilities, amount transferred between levels			$ 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	$ (1,173,000)	[1]	$ (407,000)	[1]
Net realized gain/(loss) from investment in gold sold to pay expenses	1,000	[1]	2,000	[1]
Net realized gain/(loss) from gold distributed for the redemption of shares	(1,227,000)		(1,313,000)
Net change in unrealized appreciation/(depreciation) on investment in gold	(62,000)	[1]	750,000	[1]
Net realized gain/(loss) from gold sold to cover Gold Delivery Agreement	115,000	[1]	154,000	[1]
Reserve for uncertain tax positions	0		$ 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
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	(1,173,000)	[1]	$ (407,000)	[1]
Net realized gain/(loss) from investment in gold sold to pay expenses	1,000	[1]	2,000	[1]
Net realized gain/(loss) from gold distributed for the redemption of shares	(1,227,000)		(1,313,000)
Net change in unrealized appreciation/(depreciation) on investment in gold	(62,000)	[1]	750,000	[1]
Net realized gain/(loss) from gold sold to cover Gold Delivery Agreement	115,000	[1]	154,000	[1]
Reserve for uncertain tax positions	$ 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%
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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The minimum block of shares that can be created or redeemed against gold deposits or distributions.

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Significant Accounting Policies [Line Items]

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (c)-(e)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c),9(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
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-Section 50
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Gain (loss) related to the sale of trust assets (includes, but is not limited to, gold and silver) to pay trust expenses.

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Amount recognized for uncertainty in income taxes classified as current.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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