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Related Parties - Sponsor - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017
Related Party Transaction [Line Items] |  |
Percentage of operating expenses annual fee of net asset value | 0.50% | 0.50%
Maximum [Member] |  |
Related Party Transaction [Line Items] |  |
Legal fees | $ 100,000 | $ 100,000
Sponsor [Member] |  |
Related Party Transaction [Line Items] |  |
Percentage of operating expenses annual fee of net asset value | 0.33% | 0.33%
SPDR Long Dollar Gold Trust [Member] |  |
Related Party Transaction [Line Items] |  |
Percentage of operating expenses annual fee of net asset value | 0.50% | 0.50%
SPDR Long Dollar Gold Trust [Member] | Maximum [Member] |  |
Related Party Transaction [Line Items] |  |
Legal fees | $ 100,000 | $ 100,000
SPDR Long Dollar Gold Trust [Member] | Sponsor [Member] |  |
Related Party Transaction [Line Items] |  |
Percentage of operating expenses annual fee of net asset value | 0.33% | 0.33%
The Gold Trust [Member] | Maximum [Member] |  |
Related Party Transaction [Line Items] |  |
Legal fees |  | $ 100,000

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- Definition Percentage of operating expenses annual fee of net asset value. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |