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Schedules of Investment
$ in Thousands
Mar. 31, 2019
USD ($)
oz
Sep. 30, 2018
USD ($)
oz
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Total Investment, % of Net Assets 100.03% 100.03%
Liabilities in excess of other assets (0.03%) (0.03%)
Net Assets, % of Net Assets 100.00% 100.00%
Total Investment, Fair Value $ 32,663,174 $ 28,331,953
Liabilities in excess of other assets (11,017) (9,434)
Net Assets, Fair Value 32,652,157 28,322,519
Total Investment, Cost $ 31,741,651 $ 30,017,229
Investment in Gold [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Total Investment, % of Net Assets 100.03% 100.03%
Total Investment, Fair Value $ 32,663,174 $ 28,331,953
Total Investment, Ounces of gold | oz 25,214,700 23,863,500
Total Investment, Cost $ 31,741,651 $ 30,017,229