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Counterparty Risk - Additional Information (Detail)	3 Months Ended
	Dec. 31, 2017
Risk and uncertainty [Line Items]
Gold Delivery Agreement termination period	Jun. 28, 2019
SPDR Long Dollar Gold Trust [Member]
Risk and uncertainty [Line Items]
Gold Delivery Agreement termination period	Jun. 28, 2019

X

- Definition

Gold Delivery Agreement Termination Date

+ References

No definition available.

+ Details

Name:	gldw_GoldDeliveryAgreementTerminationDate
Namespace Prefix:	gldw_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Details

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