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Significant Accounting Policies - Gold Delivery Agreement Receivable (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017 | [1]
--- | --- | --- | ---
Gold Delivery Agreement Receivable |  |
Gold Delivery Agreement receivable | $ 170 | $ 21
SPDR Long Dollar Gold Trust [Member] |  |
Gold Delivery Agreement Receivable |  |
Gold Delivery Agreement receivable | $ 170 | $ 21
[1] | No comparative has been provided as operations commenced on January 27, 2017. See Note 1.

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- Definition Gold delivery agreement receivable. + References No definition available. + Details
Name: | gldw_GoldDeliveryAgreementReceivable
Namespace Prefix: | gldw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Gold delivery agreement receivable. + References No definition available. + Details
Name: | gldw_GoldDeliveryAgreementReceivableAbstract
Namespace Prefix: | gldw_
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: |