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Related Parties - Sponsor - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Related Party Transaction [Line Items]
Percentage of operating expenses annual fee of net asset value	0.50%	0.50%
Maximum [Member]
Related Party Transaction [Line Items]
Legal fees	$ 100,000	$ 100,000
Sponsor [Member]
Related Party Transaction [Line Items]
Percentage of operating expenses annual fee of net asset value	0.33%	0.33%
SPDR Long Dollar Gold Trust [Member]
Related Party Transaction [Line Items]
Percentage of operating expenses annual fee of net asset value	0.50%	0.50%
SPDR Long Dollar Gold Trust [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Legal fees	$ 100,000	$ 100,000
SPDR Long Dollar Gold Trust [Member] | Sponsor [Member]
Related Party Transaction [Line Items]
Percentage of operating expenses annual fee of net asset value	0.33%	0.33%
The Gold Trust [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Legal fees		$ 100,000

X

- Definition

Percentage of operating expenses annual fee of net asset value.

+ References

No definition available.

+ Details

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Namespace Prefix:	gldw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gldw_SponsorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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