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Significant Accounting Policies - Additional Information (Detail) (USD $)
9 Months Ended
Jun. 30, 2014
Sep. 30, 2013
Schedule Of Significant Accounting Policies [Line Items]    
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  
Number of dilutive equity instruments authorized or outstanding 0  
Liability for uncertain tax positions - current $ 0 $ 0