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Significant Accounting Policies - Additional Information (Detail) - USD ($)
 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2014
Accounting Policies [Abstract]      
Maximum number of business days within which ownership of the gold is transferred 3 days    
Minimum denomination of shares issued redeemed against gold 100,000    
Gold contributed, Fair Value $ 5,289,912,061 $ 4,407,458,896  
Total cost of gold distributed and sold 7,606,027,651 8,721,623,674  
Total fair value of gold distributed and sold 7,371,295,384 9,051,894,397  
Net realized gain (loss) on gold (234,732,267) $ 330,270,723  
Liability for uncertain tax positions - current $ 0   $ 0