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Counterparty Risk - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017
Risk and uncertainty [Line Items] |  |
Gold Delivery Agreement termination period | Jun. 28, 2019 | Jun. 28, 2019
SPDR Long Dollar Gold Trust [Member] |  |
Risk and uncertainty [Line Items] |  |
Gold Delivery Agreement termination period | Jun. 28, 2019 | Jun. 28, 2019

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- Definition Gold Delivery Agreement Termination Date + References No definition available. + Details
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Namespace Prefix: | gldw_
Data Type: | xbrli:dateItemType
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
Name: | us-gaap_UnusualRiskOrUncertaintyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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