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Financial Highlights - Summary of Financial Highlights (Detail) - 9 months ended Jun. 30, 2015 - $ / shares
Total
Net Asset Value  
Net asset value per Share, beginning of period $ 116.97
Net investment income/(loss) (0.35)
Net Realized and Change in Unrealized Gain (Loss) (4.36)
Net Income/(Loss) (4.71)
Net asset value per Share, end of period [1] 112.26
Market value per Share, beginning of period 116.21
Market value per Share, end of period $ 112.37
Ratio to average net assets  
Net Investment Loss (0.40%)
Gross Expenses 0.42%
Net expenses 0.40%
Total Return, at net asset value (4.03%)
Total Return, at market value (3.30%)
[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.