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Significant Accounting Policies - Gold Delivery Agreement Payable (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Gold Delivery Agreement Payable
Gold Delivery Agreement payable	$ 134	$ 50
SPDR Long Dollar Gold Trust [Member]
Gold Delivery Agreement Payable
Gold Delivery Agreement payable	$ 134	$ 50

X

- Definition

Gold delivery agreement payable.

+ References

No definition available.

+ Details

Name:	gldw_GoldDeliveryAgreementPayable
Namespace Prefix:	gldw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Gold delivery agreement payable.

+ References

No definition available.

+ Details

Name:	gldw_GoldDeliveryAgreementPayableAbstract
Namespace Prefix:	gldw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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