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Significant Accounting Policies - Summary of Trust's Investments at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
 [4]
Schedule Of Significant Accounting Policies [Line Items]    
Investment in Gold $ 26,852,191 [1],[2] $ 30,250,898 [3]
Investment in Gold [Member]    
Schedule Of Significant Accounting Policies [Line Items]    
Investment in Gold 26,852,191 [1],[2] $ 30,250,898
Level 1 [Member]    
Schedule Of Significant Accounting Policies [Line Items]    
Investment in Gold 26,852,191  
Level 1 [Member] | Investment in Gold [Member]    
Schedule Of Significant Accounting Policies [Line Items]    
Investment in Gold $ 26,852,191  
[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 unaudited 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 unaudited financial statements.
[3] Investment in Gold is held at the lower of average cost or market value. The average cost of Investment in Gold at September 30, 2014 was $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.