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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Statement of Partners' Capital [Abstract]          
Net Assets - Opening Balance     $ 35,657,505 $ 40,293,447 $ 40,293,447
Creations     4,003,820   11,161,181
Redemptions     (4,686,586)   (13,903,151)
Net investment loss $ (35,233) $ (31,847) (70,221) (67,765) (136,084)
Net realized gain/(loss) from investment in gold sold to pay expenses 1,918 (898) 2,508 (830) 252
Net realized gain/(loss) from gold distributed for the redemption of shares 148,686 (71,852) 187,077 (277,748) (222,162)
Net change in unrealized appreciation/(depreciation) on investment in gold 591,410 $ 2,317,536 907,169 $ (2,362,015) (1,535,978)
Net Assets - Closing Balance $ 36,001,272   $ 36,001,272   $ 35,657,505