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Document and Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2016
Nov. 25, 2016
Mar. 31, 2016
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Sep. 30, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Trading Symbol GLD    
Entity Registrant Name SPDR GOLD TRUST    
Entity Central Index Key 0001222333    
Current Fiscal Year End Date --09-30    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   298,400,000  
Entity Public Float     $ 32,760,852,000