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Related Parties - Sponsor, Trustee, Custodian And Marketing Agent Fees (Details Textual) (USD $)
 3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Related Parties - Sponsor, Trustee, Custodian and Marketing Agent Fees (Textual) [Abstract]        
Trustee maximum fee $ 2,000,000      
Trustee minimum fee 500,000      
Marketing agent [Member]
        
Related Parties - Sponsor, Trustee, Custodian and Marketing Agent Fees (Textual) [Abstract]        
Related party fees payable at annual rate 0.15%      
Trustee [Member]
        
Related Parties - Sponsor, Trustee, Custodian and Marketing Agent Fees (Textual) [Abstract]        
Related party fees payable at annual rate 0.02%      
Sponsor and Marketing Agent [Member]
        
Related Parties - Sponsor, Trustee, Custodian and Marketing Agent Fees (Textual) [Abstract]        
Ordinary expenses accrual rate if gross assets drop discussion If at the end of any month, the estimated ordinary expenses of the Trust exceed an amount equal to 0.40% per year of the daily ANAV of the Trust for such month, the Sponsor and the Marketing Agent will waive the amount of such excess from the fees payable to them from the assets of the Trust for such month in equal shares up to the amount of their fees      
Unforeseen expenses of the Trust discussion if the Trust incurs unforeseen expenses that cause the total ordinary expenses of the Trust to exceed 0.70% per year of the daily ANAV of the Trust, the ordinary expenses will accrue at a rate greater than 0.40% per year of the daily ANAV of the Trust, even after the Sponsor and the Marketing Agent have completely waived their combined fees      
Assets under management required for Trust accrual 1,200,000,000   1,200,000,000  
Trust expense ratio 0.40%      
Sponsor and Marketing Agent combined fees at a rate 0.30%      
Sponsor and Marketing Agent fees reduction $ 0 $ 0 $ 0 $ 6,798
Accounting rate of ordinary expenses after taking affect of current expenses 0.40%      
Minimum ANAV to Unforeseen Expenses 0.70%      
Sponsor [Member]
        
Related Parties - Sponsor, Trustee, Custodian and Marketing Agent Fees (Textual) [Abstract]        
Related party fees payable at annual rate 0.15%      
Custodian Tier Two [Member]
        
Related Parties - Sponsor, Trustee, Custodian and Marketing Agent Fees (Textual) [Abstract]        
Related party fees payable at annual rate 0.06%      
Aggregate weight of gold to determine custodian fee tiers 4,500,000      
Custodian Tier One [Member]
        
Related Parties - Sponsor, Trustee, Custodian and Marketing Agent Fees (Textual) [Abstract]        
Related party fees payable at annual rate 0.10%      
Aggregate weight of gold to determine custodian fee tiers 4,500,000