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Financial Highlights - Summary of Financial Highlights (Detail) - $ / shares
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Net Asset Value    
Net asset value per Share, beginning of period $ 106.68 [1] $ 116.97
Net investment income/(loss) (0.47) (0.45)
Net Realized and Change in Unrealized Gain (Loss) 19.94 (9.84)
Net Income/(Loss) 19.47 (10.29)
Net asset value per Share, end of period 126.15 106.68 [1]
Market value per Share, beginning of period 106.86 116.21
Market value per Share, end of period $ 125.64 $ 106.86
Ratio to average net assets    
Net Investment Loss (0.40%) (0.40%)
Gross Expenses 0.40% 0.42%
Net Expenses 0.40% 0.40%
Total Return, at net asset value 18.25% (8.80%)
Total Return, at market value 17.57% (8.05%)
[1] Effective October 1, 2014, SPDR® Gold Trust (the "Trust") adopted the financial presentation provisions for an investment company. See note 2.2 to our audited financial statements.