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Significant Accounting Policies - Summary of Trust's Investments at Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
[3],[4]
Investment Holdings [Line Items]    
Investment in Gold $ 24,503,318 [1],[2] $ 30,250,898
Investment in Gold [Member]    
Investment Holdings [Line Items]    
Investment in Gold [2] 24,503,318  
Level 1 [Member]    
Investment Holdings [Line Items]    
Investment in Gold 24,503,318  
Level 1 [Member] | Investment in Gold [Member]    
Investment Holdings [Line Items]    
Investment in Gold $ 24,503,318  
[1] Effective October 1, 2014, the SPDR® Gold Trust (the "Trust") adopted the financial presentation provisions for an investment company. See note 2.2 to our audited financial statements.
[2] Effective October 1, 2014, the Trust adopted the financial presentation provisions for an investment company. Disclosure of a schedule of investments is required for investment companies. See note 2.2 to our audited financial statements.
[3] Investment in Gold was held at the lower of average cost or market value. The average cost of Investment in Gold at September 30, 2014 is $30,728,152.
[4] Represents audited statement of financial condition as of September 30, 2014 prior to adoption of provisions for an investment company for accounting purposes.