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Subsequent Events - Additional Information (Detail) - Sponsor [Member]		9 Months Ended
	Jul. 17, 2015	Jun. 30, 2015
Subsequent Event [Line Items]
Related party fees payable at annual rate		0.15%
Subsequent Event [Member]
Subsequent Event [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

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
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:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: