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Derivative Contract Information - Summary of Average Daily Notional Value of Derivative Contracts Outstanding (Detail) - Over-the-Counter ("OTC") [Member] - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gold Delivery Agreement Average notional | $ 18,106 | $ 22,963
SPDR Long Dollar Gold Trust [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gold Delivery Agreement Average notional | $ 18,106 | $ 22,963

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- Definition Average daily notional value of derivative contracts outstanding during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | na
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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=gldw_SPDRLongDollarGoldTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |