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Related Parties - Sponsor and Trustee - Additional Information (Detail)	6 Months Ended
	Mar. 31, 2018
Sponsor [Member]
Related Party Transaction [Line Items]
Related party fees payable at annual rate	0.40%

X

- Definition

Related party fees at the annual contractual rates charged on the daily adjusted net asset value of the Trust.

+ References

No definition available.

+ Details

Name:	gld_RelatedPartyFeesPayableAtAnnualRate
Namespace Prefix:	gld_
Data Type:	num:percentItemType
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_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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