v3.26.1

Note 3 - Related Parties - Sponsor and Trustee (Details Textual) | 6 Months Ended
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Mar. 31, 2026
Sponsor [Member] |
Management and Service Fees, Rate | 0.40%

X
- Definition Rate for management and service fees under arrangement to manage operations, including, but not limited to, investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 + Details
Name: | us-gaap_ManagementAndServiceFeesRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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